Hi Maybe you need to figure out why the old grass died so you will not have that problem again after you spend all that money reseeding it. When you could have just needed to put some fertilizer on it and did some watering for a little time and got it going again. I have been through that starting a new lawn and it a lot of work ,it would be a lot easier to try to get your old one going again if you can and maybe it to far gone and you have to reseed. But i think i would do a soil sample and send it in to your state agriculture extension office and have them tell you what you need to do first,before i spend much money and get it figured out. Contact them and they will tell you where to get the soil from and how much and how deep and where to sent it to , and some times they have container to put your soil in. I think i would do that first.