which way to fins go? and board selection

on my cheap board, has 1 center fin on front and rear. do they go in the same direction or opposite directions? do i need a front and rear fin?

this is board i got sunday just to see if i like boarding...i promse im getting a real board soon.

anyone rec a good board for a 180-185 pounder?
water is never really smooth here on the coast and im in an I/O if that matters.


Thanks.