Are you going to do mom/clones in the same space? If so, you might want to subdivide into one 10x10 and one 4x10- You can use the 4x10 for keeping moms, rooting cuts, and whatever veg time you want. Will also give you a place to keep supplies, tools, etc

I'd be thinking

Mom/cut room- at least one 48"t-5 4-bulb for the cuttings, at least one for the moms, and a 400 halide for veg. Stick a workbench in there too.

Flowering room- you could probabley get away with 4 600 watt sodiums, but I'd really rec going with 4x 1K.

What's the roof on this shed? How hot is it gonna get during the day?