What do I need to buy far as plumbing supplies to install a shower in the basement

OK lets talk about your drain thoughts first. Do you have an existing drain or will you be busting out some floor to install the trap and drain? I'd recommend a fiberglass shower pan like Mustee, Lasco or Swanstone. These get attached to the concrete floor by gluing them in with thinset. Tell me about your drains and we'll go from there. Also, we need to move you to plumbing so the plumbers will jump in.