Two questions:

I'd rather not have two sub cables connected together in the wall, but if I have to what is the connector I need for that?

Does home depot have CL rated wire for in wall use? (I'll find this one out tomorrow, but would like a backup plan if the answer is no...Radio shack perhaps?)

Make that 3 questions...Do I need the wall plates now, or just put the cables in the electical boxes and add wall plates later with them hooked up to the plates?