Two aspects of board shapes are kick height and concave. Kick height is how steep the nose and the tail on the deck while concave is how much the board curves inward toward the middle starting at each side.
Some prefer using a deck with higher kicks since it gives more pop, but starters find it difficult to control. Many prefer medium to low kicks since it gives a more relaxed feel. I advise beginners to choose medium kicks so that they can decide whether to go for a higher or lower kick height for their next board.
Concave plays an important role in catching flip tricks as it gives the rider control of the fingerboard. More concave can be helpful if you’re doing a lot of flip tricks, but flat decks are good for beginners. Again, I advise going first for medium concave and decide what is suitable for you.
There are a lot of different wooden fingerboard maker that offers different board shapes. Try purchasing first the cheaper ones as it performs almost the same as the expensive decks. When you are certain of what is the right shape for you, go for whatever brand you want.