The back, with sod: Just give it some time. The roots are all in the top
layer. Give it some time to grow into your soil. Also, did they water before
laying the sod? If they didn't, or you don't know, give it a deep watering
(also allowing time for it to penetrate.) Make sure you get the water deep
enough to go into your soil, rather than just in the sod.

The front: Definitely remove the rocks. Add some compost on top. rake it in
a little. Broadcast the seed, cover with straw, keep it moist for about 2
weeks, and you should see some results.