Getting my first room ready. Need a little help

I have two small sheds one is 2x4x6 and the other is 2 1/2x4x6. The smaller box I want to veg and a small area for clones. The largger box I want to have my flowering plants. Should I use 400 or 600 watt lights. And is it best to use hps in one and mh in the other. I want to grow in soil and i have a 400 cfm fan to pull air from both rooms. Might need Ac? Thanks for any input

I think you should be fine with the 600 watt, as long as you got that fan to pull the air out. You want HPS for flowering, and MH for veg, so yes, I would get a 250-400 watt MH for the veg room.

buy some cheap CFL's and veg with them and use your HID's for flowering.

I'd get a 400W for veg and 600W for flowering.
MH for veg and HPS for flowering.

I'd also get an air cooled hood and some vents to move air around. If its still too hot an AC might be needed.

I got around the same space, just half your height and a bit less width. Check my journal out