newbie buying a 6'4 fish. your thoughts please!

a little help guys. here is where im at:
i'm a newbie just fresh from paddling to the line up and catching my own waves, riding the white water till the beach (weee!). now i should be getting a long board of my own right? probably a 9 footer or maybe 7'6 mini-mal to further my skills in this first chapter of my surfing. but no, i've been reading a lot about boards and im planning to buy a Walden Magic Fish, 6'4 22w 3th as my first board. so basically my question is.. will I be regretting this purchase?
it is said that the fish floats like a longboard and rides like shortboard. now as a beginner who wants to start improving, will the FISH be the board to use? plus since it's short it is very ideal for travel fitting into cars and vans well. so im really looking at this purchase to be fruitful for me in many ways. but if it won't really help me, i'll probably get a long board then. i dont want spend on a board that i wont be use. please please kind people any advice is appreciated.
also, im only 5'7 at 150lbs. according to the charts the most appropriate for me is 5'8 fish and not a 6'4. sadly, a 6'4 is only available. what problems should this cause when im already out there trying to surf?
i'm a newbie just fresh from paddling to the line up and catching my own waves, riding the white water till the beach (weee!). now i should be getting a long board of my own right? probably a 9 footer or maybe 7'6 mini-mal to further my skills in this first chapter of my surfing. but no, i've been reading a lot about boards and im planning to buy a Walden Magic Fish, 6'4 22w 3th as my first board. so basically my question is.. will I be regretting this purchase?
it is said that the fish floats like a longboard and rides like shortboard. now as a beginner who wants to start improving, will the FISH be the board to use? plus since it's short it is very ideal for travel fitting into cars and vans well. so im really looking at this purchase to be fruitful for me in many ways. but if it won't really help me, i'll probably get a long board then. i dont want spend on a board that i wont be use. please please kind people any advice is appreciated.
also, im only 5'7 at 150lbs. according to the charts the most appropriate for me is 5'8 fish and not a 6'4. sadly, a 6'4 is only available. what problems should this cause when im already out there trying to surf?