First off try this link,
http://www.nfhs.org/PDF/Basketball/BBsignals.pdf for your signals.
I take it that a local group such as a rec league or a CYO league runs the clinics you attended? As Mick said, talk to them. They should have provided you with a copy of the NFHS Rules Book. Even more than that a copy of the Simplified and Illustrated book which has the basic rules and drawings of how they are applied. This is the one book we give all of our starting officials in the rec league I help run. It will serve you well until you want to move up into high school scholastic leagues where you need to be certified.
As for as boards to read, I know of none that handle only your level of refereeing. Try a Google search for some. This board can be of great help as there are some very smart people here. Hang around and read ALL of a thread that interest you. You will see that there are several ways at looking at situations but there is only one way at looking at a rule. Some of what is said may be above your level, we have some WNBA refs here, but it is all good info. If you want to ask a question be sure you preface it by saying that you are 14 and doing rec games so we know how to look at it.
Some last things, if you keep at refing you can make some good easy money. I started my now 19 year old refereeing at 12. I deposited every penny he made in a savings account for him and by the time he went off to college he had several thousand of dollars in it . He now does college intramural games for a little extra money. His studies come first, as should yours, so he is not going to become a certified ref until after college. Next DO NOT let the coaches or the fans get to you. You are not out there out make friends. Stick to your calls. Remember these words after you make a call, Coach that is how I saw it.
Have fun!!!!!
[Edited by RecRef on Dec 11th, 2002 at 11:13 AM]