you are a little late. Start 6 weeks before frost--8 weeks is better--or when daily temps come down below 85 degrees in fall. If not sod, than a high quality seed suited to your climate, irrigation, soil and planned use of the lawn. If the soil is warm--and moist--you should see a bit of grass after 7 days. Drop seed and starter, rake it in.
If not use hydroseed.