Small hands are a disadvantage but I've yet to see anyone whose hands are too small to palm cards. It's just about technique.
The best way to get started in card magic is to buy yourself a copy of Hugard and Braue's The Royal Road to Card Magic or Giobbi's Card College. Both are available from
Magic Box as wel las other places.
Royal Road is cheaper as CC is multi-volume and hardback, but much more comprehensive. I'd recommend getting the Royal Road and seeing how you get on with it before committing too much cash. It has a chapter on palming.
People here tend to be very helpful with any questions or problems you might have, but they like to see people post to the Introductions forum when they first register. Also check out Seige's sticky post in that forum.