Request advice on how to properly shim up my door on my B body

Does anyone have any recommendations for: specific parts, techniques, symptoms to be aware of or potential problems?

I can just loosen the door and tighten it again, but that is only going to get me half way there.

73 Plymouth Road Runner (like my avatar)

-Thanks FABO!

Are your hinges worn and need rebuilt? Most of the time that is the real issue. I would look at that first. If that is the case I would rebuild them myself, get them rebuilt by the member here that rebuilds them or find some good used ones.