Sowing grass seed on clay soil, what next ?

Today I have turned over the compacted clay soil in my garden and added compost, which was I must say was back breaking work! Should I walk over it and level it with a layer of topsoil before I sow grass seed?

Some of the clay clods are a bit sticky and hard to break down and another area I did earlier in the week some
clods are hard but do break down with some energy!