I've got no idea what that board is like but spending $40 to buy a board with no fins and you're not sure , I'd be absolutely sure and avoid it completely, spend more time looking and that may save you money in the long run.
I would however leave major repairs like placing fins etc. alone, too easy for the newbie to have disaster.
If you see something that you think might be what you want post a picture and help could be on its way
I've taken up troll hunting just for fun, instead of a rifle I'll just use a pun!