Several classic beginner questions rolled into one scenario!

Hey dudes, so I looked around the internet and this seemed the most un-intimidating forum to describe my situation. Thanks in advance to anyone who might reply, and sorry for what I am sure is a massive wall of text to follow this opening paragraph. So here it goes, grab a drink and sit back...
I'll be flying out to Panama (200 bucks round trip!
) in January. I'll be staying there for all of January and February. The majority of the time I'll be staying in Pedasi, I have several opportunities lined up, but the truth is that becoming a decent surfer is at the top of my list. Pedasi is apparently home to a terrific surfing beach in Playa Venao (I think they've held some championships there), Hostel rooms seem ok price wise (you'll notice throughout this post that I am the consummate cheapskate), so I don't think it's out of the realm of possibility that I could stay on or near the beach. I'll have a decent amount of free time on my hands and I somehow doubt that Pedasi, Panama is a "happening" place, so I should have the opportunity to devote a significant portion of my time every day (4-5 hours at least depending on how early I wake up) to surfing. Which is really perfect for my obsessive, compulsive, want-to-be-good-at-everything attitude.
My ability: Is one of a beginner, I've surfed some and loved it. I've grown up sailing Hobie Cats, Wakeboarding, and Water-Skiing, so I'm definitely comfortable in the water and passionate about its respective pastimes. But I just haven't found the right time to get into surfing until now. I honestly feel like this trip is a great opportunity from that standpoint, it gives me the chance to really live and breath it for a couple months.
My dilemma: After looking at how much it costs to rent a board for a two month period I'm now on the hunt for a surfboard/s that travel/s well and is decent for a beginner. Going out and plopping money on a brand new board is just not my style. So craigslist is where I'll probably be looking unless I get pointed somewhere else. So, the airline says that I can take two boards with me on the plane with a length no more than 115 inches (292 CM) and weighing no more than 70lbs (31.75 KG). I own a a crappy costco Wavestorm fomie that I've messed around with, worst case scenario, it'll be one of the boards that make the trip. My first thought was to take that and look for a potentially smaller board to take as well. But to be honest lugging that thing (Wavestorm) to a foreign country seems kind of ridiculous. On top of that, everywhere I look I see the "Don't try and learn on smaller board!!" command and I understand it. I have no misconceptions about "looking cool", I'm going to look like a complete idiot out there, period. But for weight/travel purposes getting a smaller board would be smarter and the other variable is my younger sister (age 15) will be joining me later on, so a smaller board might be better for her as well.
Finally!
My question: All this leads to me having a lot of confusion and not a whole lot of time to figure it out. I think getting a shorter 6'8"-10" board with a high volume/width (for stability and ease of paddling purposes) would be a good idea. It would give my sister something to learn on and give me something to aim toward. Long story short, I want to learn, I want to have fun, I would also like to look as little like an idiot as possible. What should I do? What board/s should I get/look for given my learning and travel constraints? What would be the best possible board combo for a trip like this? For reference I'm 5'9" and weigh about 135-140, age 18 and athletic. Thanks again for your patience and insight.
PS: Mods if you'd rather move this to the travel section that's fine wasn't sure which board to post in.
I'll be flying out to Panama (200 bucks round trip!

My ability: Is one of a beginner, I've surfed some and loved it. I've grown up sailing Hobie Cats, Wakeboarding, and Water-Skiing, so I'm definitely comfortable in the water and passionate about its respective pastimes. But I just haven't found the right time to get into surfing until now. I honestly feel like this trip is a great opportunity from that standpoint, it gives me the chance to really live and breath it for a couple months.
My dilemma: After looking at how much it costs to rent a board for a two month period I'm now on the hunt for a surfboard/s that travel/s well and is decent for a beginner. Going out and plopping money on a brand new board is just not my style. So craigslist is where I'll probably be looking unless I get pointed somewhere else. So, the airline says that I can take two boards with me on the plane with a length no more than 115 inches (292 CM) and weighing no more than 70lbs (31.75 KG). I own a a crappy costco Wavestorm fomie that I've messed around with, worst case scenario, it'll be one of the boards that make the trip. My first thought was to take that and look for a potentially smaller board to take as well. But to be honest lugging that thing (Wavestorm) to a foreign country seems kind of ridiculous. On top of that, everywhere I look I see the "Don't try and learn on smaller board!!" command and I understand it. I have no misconceptions about "looking cool", I'm going to look like a complete idiot out there, period. But for weight/travel purposes getting a smaller board would be smarter and the other variable is my younger sister (age 15) will be joining me later on, so a smaller board might be better for her as well.
Finally!
My question: All this leads to me having a lot of confusion and not a whole lot of time to figure it out. I think getting a shorter 6'8"-10" board with a high volume/width (for stability and ease of paddling purposes) would be a good idea. It would give my sister something to learn on and give me something to aim toward. Long story short, I want to learn, I want to have fun, I would also like to look as little like an idiot as possible. What should I do? What board/s should I get/look for given my learning and travel constraints? What would be the best possible board combo for a trip like this? For reference I'm 5'9" and weigh about 135-140, age 18 and athletic. Thanks again for your patience and insight.
PS: Mods if you'd rather move this to the travel section that's fine wasn't sure which board to post in.