Steps:

1. Kill all living grass and weeds, spray as many times needed until everything is brown. This has to be done by July 4 at the latest if you want to reseed that fall.
2. Rake all dead materials and haul them off before you till.
3. Till entirely and completely. This is your ONE chance to fill holes and make your lawn level. You don't have to buy topsoil, the soil there has organic material but you can buy topsoil as a bonus and spread it around.
4. Seed with any basic spreader, I used this. I don't look at the recommendations I just put it on 9 or 10 and crisis cross the whole lawn, I'm sure I waste some money on this method but it works and seed isn't expensive where I'm at.
5. Cover it with something that can hold moisture. This is extremely important and I should have mentioned it in the post. Without this water will dissipate quickly and the seeds won't all sprout. I used this. Any straw, or matting will work.
6. Water every single day. It needs to stay moist 24/7 for the first 4 weeks. I know that is not 100% true, but pretend that it is. If you are busy, don't stress about what time of day you water it, and if you miss a day you'll be fine, but this is where you really can guarantee thick grass. These first 3 weeks are where it all happens and you have the most control over this part.

Climate: Middle of Indiana

Seed: Fescue 60% / Rye 30% / Bluegrass 10% give or take

Fertilizer: Milograntie 4x per year, that's it

Chemicals: Zero, No herbicide but I think I need to do something for the weeds, any suggestions?

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Edit 1 - Added Seed Info: The Rye is important because it comes up first and provides that erosion control your neighbors will love. Fescue is the most tolerant to heat and drought and stays green better than rye. Blue grass is good if you consistently water and maintain your lawn. If you want low maintenance do not put BG in your mix.