[member="Evie Miramat"] - First off welcome, hope you enjoy your time and writing here.
[member="Kor Vexen"] has some very good insights there. Only thing I would add is each major has it's own flavor. I would suggest checking many out, see if any have the flavor you like. The writers and leadership of each faction are improtant also.
So my two cents are to read up on a bunch, narrow them down, then contact a few and get to know the ones you like best.