Sorry, yes it would be an overseed and the back yard needs to be leveled big time. I think I may go with the tall fescue blend for a more durable lawn during the summer. The problem is that the previous owner did zero lawn care and let her dogs fuck up the yard for years. The plus was we got the home for a good price and she wasn't horrible to negotiate with. The backyard went from a step above section 8 to ehhh, now I want it to be a show piece for the next owner.
Thanks for the tip of rural king and Ohio Mulch. I can have Ohio Mulch or Kurtz brothers bulk deliver soil and go with Rural King for seed.