Bedroom Studio Layout

Hello there. I'm about to set up my home studio in a small spare bedroom & was wondering if anyone had any suggestions for getting the most accurate stereo field based on my room dimensions. So far i've set up some 4" bass traps made out of 703 & have noticed a great improvement in the bass response. I haven't move my gear in yet as i'm thinking i may need a bit more treatment. I'll be using the room for tracking vocals and mixing... thanks in advance. Dor