I agree with what JBS said. Also....
if you're wearing the
dowel grips the finger holes should be at your first knuckle (maybe a little below). If you rip you can always put a tape grip on underneight your own grip to protect the rip from getting infected.
To check the sizing of your grip after you get them just ask your coach. If you're buying from Ten-O, I recommend getting a size one, unless you have really really small hands (then get a zero). I personally always wore size 2s--but you'll figure out which size you prefer as you wear them more.