Cost for Septic System and Well

Lots of great info here, guys and thank you for your time. I lost my beautiful wife in 2020 as a direct result of the greatest lie of our lifetimes. Now those same liars have made it nearly impossible for any of us to follow our dreams, that's why I am struggling to get factual numbers for this stuff. So, the property I "won the bid on" in Nashville was 5 acres with a really cool "tiny house" on it and a big shed. I was excited because I could live in the tiny house and put all my stuff in the shed while the barndo was being built. Come to find out after doing due-diligence, the septic system is right where the barndo would need to be built, so I canceled the deal. Also only about 2 of the 5 acres are useable due to bad topography. Land in the Nashville area is VERY pricey so I have to be really careful with everything I plan. The best case would be to find a lot that already has systems in-place that don't interfere with my plans, but if I can't find something like that, I'll have to build from scratch, that's why I need an idea of the cost of this stuff. It's all really confusing and disappointing. Three years ago I could have bought anything that looked good, knowing that I would be OK with whatever everything else would cost me. NOT NOW ! Now I'm struggling with all kinds of financial decisions including buying or building something that won't wipe-out all of my savings. This barndo was a big dream of mine that I feel I deserve, but at this point I might need to buy just a "normal person's" small home and maybe just build a big garage on the property. I'm fortunate to have that option though. Thanks again.