Help with 3 speed hub with drum brake

Hello all I have a set of sturmey archer hubs with drum brakes. They were in non working shape when I got them, I want to use them on a new set of rims I put together for a build. My question is can anyone help me with making sure they work properly, I don't want to build a wheel around them and not have them function properly . I seem to have all the parts I think, I just want to learn more about them through a hands on experience. If anyone has time to teach a kid i am willing to learn .