Lordy is correct, have a look at the NRA web site. You need to be a member of the NRA or an approved and affiliated club (NRA membership is often cheaper) before you can shoot you will need to do a shooter competency test which is no big deal, this is mandatory and enables you to shoot on MOD owned ranges this can be arranged through the NRA. Once you have jumped through these hoops you can book a range online and hire rifles if necessary.