Dont till the soil, instead use "weed & Feed" A type of fertilizer soon to be banned due to its (weed oriented) herbicide factor. You can get a bag at home depot for $13. That'll really help eliminate any weeds & gives your sod a head start.
When you till the soil when laying sod: it makes it very difficult to gauge how high or low the sod will be when the ground is finally compacted over time.
"The music business is a cruel and shallow money trench, a long plastic hallway where thieves and pimps run free, and good men die like dogs. There's also a negative side"