when i am buying a new skateboard i usually do this:
you would need to look at your feet.
get a board, stand on it, and see if your feets are too large or too short. i like it when i can have approximetley 40cm between my left foot and my right foot (i ride goofy) it would be like ~70cm long.
some boards, like girl, have a thinner edge. i don't know what that is good for, but i guess girls prefer it
. anyway like Element (what i'm riding now) you have a lovely large edge where you can put your whole foot on while doing tricks. it is also a lot easier to do casper stand and other stuff when you have a bit more to balance on.
also note that it isn't the board that create the tricks. it is your trucks. i love Tensor, they are powerfull. if you like to do flips then get tensor
i have been skating for 7 years now, and the only trick i know is a 50cm+ ollie :/ i can't even land a kickflip. so i guess i'm pretty noob. but after i bought my Element board i have definetly improved! i used to ride noob boards, like the one you get for $25 etc. finnaly i got a job and bought a $200 board. so you reall get what you pay for
now i can do alot more tricks like 360, kickflip, varial flip, big spin and more
though where i live it's all flat, there's absolutely NO place to skate. so i usually train on flat land, like casper and stuff. but that is WAY too advanced for me yet.
good luck on finding your board online though. i would prefer to go in the shop and try them out first.
ps. i'm the only one where i live who skate so it gets lonely and i cant try cool stunts out incase something would happen :/