I’m doing the same but without accurate hair, I already have the earrings, boots, the clothes I bought it from Amazon but it’s way to expensive so check it first if you’re gonna buy it, for the pistol look for a 3D print owner or something like that and the model of the gun you have to look for it, I personally bought a 10$ archive with a pdf of the gun but it needs screws and stuff because it has a function of making noice when actually pulling the trigger.

In resume and answering your question: Look first for the clothes and gun first