Good at other stuff but not surfing, help with 1st board?

Hello,
I'm trying to find a good 1st board and the internet is confusing. I think I'm probably better situated than most to enter the surfing world. I swear I'm not trying to brag, but I want to give as much info as I can to get the best info back. I'm a prior swimmer, and in better shape both upper and lower body now than I was when I was competing (finally got pull-up #11, hey-oh!!). And my balance is better than average - indo boards, tricky yoga poses, slacklines, I'm good with those. I can wakeboard, I can snowboard. I'm a girl. I'm 5'9" and 135lbs (175cm and 61kg). I've stood up a few times over the years on a foam board, but I want to actually get into the sport, now.
So there's my background and here's my question: I obviously need something learnable, but I don't want something I'll outgrow in a few months. I know prevailing opinion is that new guys should get a big board, but do you think I could manage on a fish? Do you think a mini mal would be fun after the 1st few months? Both those boards are pretty ideal for the surf in my area, according to what I've read (i.e. according to the people trying to sell them on Craigslist).
Thanks in advance, guys. And sorry for what I'm sure is the millionth "please help this new guy buy a board" post.
I'm trying to find a good 1st board and the internet is confusing. I think I'm probably better situated than most to enter the surfing world. I swear I'm not trying to brag, but I want to give as much info as I can to get the best info back. I'm a prior swimmer, and in better shape both upper and lower body now than I was when I was competing (finally got pull-up #11, hey-oh!!). And my balance is better than average - indo boards, tricky yoga poses, slacklines, I'm good with those. I can wakeboard, I can snowboard. I'm a girl. I'm 5'9" and 135lbs (175cm and 61kg). I've stood up a few times over the years on a foam board, but I want to actually get into the sport, now.
So there's my background and here's my question: I obviously need something learnable, but I don't want something I'll outgrow in a few months. I know prevailing opinion is that new guys should get a big board, but do you think I could manage on a fish? Do you think a mini mal would be fun after the 1st few months? Both those boards are pretty ideal for the surf in my area, according to what I've read (i.e. according to the people trying to sell them on Craigslist).
Thanks in advance, guys. And sorry for what I'm sure is the millionth "please help this new guy buy a board" post.