I’d save every last penny you can, save it all spend almost nothing in the states while you are there. And focus your energy on a career that pays you in USD but you can work remote in Thailand. 6 years is plenty to figure that out, but they will want you to have income, even if you have a million saved, they will be more focused on you Atleast making 1600 ish USD a month.
you guys can lease land, which also isn’t ideal, I would think you would be paying top $ for the lease as a foreigner. you can buy business’s/condominiums, on the land but also in that case you don’t own the land, it’s easier for you guys to conduct businesses here but end result is still not owning any land.
You can only buy condo’s as a foreigner, even with retirement status. Unless I’m wrong. I hear that’s not ideal if you want to sell it later on. So finding a nice woman here that you love and trust is the best choice. As all land purchases have to go through her.