If you are looking for advice from experienced surfers keep a few things in mind:
You seem confident that once you are up on your feet riding the wave that you will be able to rip and shred, based on your skateboarding experience you may have an edge in this area compared to most beginners. However in order to be up on your feet and riding the wave you need to accomplish several things first.
a.) Know when and where to paddle out to catch a suitable wave that you can catch and ride.
b.) Paddle out to that spot and stay in that spot as the wind and currents move you in the ocean.
c.) Know how to read the incoming waves to determine which waves to paddle for or pass.
d.) Know how to position yourself to put yourself in the best position to catch a particular wave.
e.) Paddle on your belly to catch a wave
f.) Pop-up to your feet without falling off the board, stalling and losing the wave, or nose-diving.
g.) Angling, trimming, or turning the board to ride along the open face of the wave.
h.) Adjusting to the wave as is steepens, flattens out, breaks ahead of or behind you.
i.) Trim, cruise, turn, nose-ride, rip, shred, bust airs, whatever you want to do, express yourself, the fun stuff.
Once you catch a wave and it finishes you have to repeat from step b. for each and every wave you catch or miss. This means most of your time in the water will be spent paddling and reading waves. If you can't paddle or read waves effectively you will not get the opportunity to even reach step f.
Since most of the physical aspect of surfing is comprised of paddling you should work on your paddle fitness, so work on your cardio, swimming freestyle, or practice paddling on your board if there are no waves. The mental aspect of surfing is reading waves, learn to read surf forecasts, understand the tides, winds, and currents. Watch the waves form and break, watch where they break, understand why they break. No two waves are the same, but understanding the wave patterns will help you on steps a thru d.
About your boards, enough has been said about them already... More thought should have been put into the waves you most likely will encounter in your area. It looks like the summers are flat and calm and generally un-surfable most days. In the fall, winter, spring you get bigger waves but with stormy, windy conditions. If you wanted to surf something short you should have gotten a fish or groveler, but those are for more advanced surfers and you don't need those yet. You should get a longboard to go along with your 7'6" fun-board then you would have the opportunity to surf more days each year. The more you surf the better you get, if you go a month or longer without surfing then you will not improve or get worse. By failing to obtain a board best suited to the conditions in your area you are holding back your own progress. If your goal is riding that 5'11" HPSB within a couple of years, then you need to get a longboard to practice and stay fit on weak small days.
You are going surfing on the 17th, here is the forecast from Magic Seaweed for a spot called Surfer's Paradise:
http://magicseaweed.com/Surfers-Paradise-Surf-Report/142/Use this guide to help interpret the forecast for that day:
http://magicseaweed.com/help/Looking at the swell size, wave periord, wave direction, tide, and wind direction, what do you expect the conditions for that day to be? Would it be a good day to take out the shortboard or funboard? When would be the best time to go surfing? What would be the best spot in your area based on those conditions?
Watch all of these videos several times over:
http://surfsimply.com/surf-simply-tutorials/I'm not trying crush your stoke, just giving you some helpful advice that I learned from others on the forum and from my personal experience.
Let us know how it goes after your first session.
