board set up

I'm an advanced water skiier but new to wake boarding. 2 questions 1) I won a CWB Sol 135, according to everything I have read this is too small for me. 6'0 190lbs. But it is FREE. My question is "what does this mean to me being a totally new rider? Can I get by for a while or am I getting off to a really bad start? 2) It came with two large fins. Put them on or not, or put just one on, etc? Need advice.

It is too small for you.

If it is new (unused), any respectable retailer should exchange it for the Sol 141.

Ideally it is to small for you but everyone is different and you might enjoy the board. First problem you might run end to is the stance, I would recommend standing next to the board and seeing how wide your stance is. Also because you are 6ft you might feel like there is not enough board under you.
Second your weight is more of an issue here because the board is rated for about an 160lbs, so it might be harder for you to stand up.
Yes but the center fin in that you help you control your board riding without the fin will make the board feel squirrely and really won't help you develop your riding.

Sorry to cut this short but my time at work is up. If you want tomorrow I could expand on any questions you have.