welcome. First of all try to find a local club that holds 3-D's. Most clubs have the same set of rules and should be able to tell you what they are.Most score the targets 12,10,8,5. The 12 being the smallest ring. If you tell the club what type of equiptment you are using, they will help put you in the proper class. As far as equiptment, you can use what you hunt with. If you are looking for more of a pure 3-D set up, that may be a little different from what you are using. It all depends on what you are looking for.(speed, forgivness,ect.) Hope some of this helps. If you need more info, let me know. Good luck.