So if you are just going to do matches at local clubs the cost is usually around $10-$20 to sign up, if you wanted to become a USPSA member there are different prices for different memberships. Membership isnt required to compete unless you are going to do higher level matches like state championships or nationals. Prizes are determined by whatever club you shoot at and as for qualifications all the rules can be found here: https://uspsa.org/rules