I think you need a lawyer and/or someone to check your finances. All the things with the back taxes, penalties and fees don’t sound right, someone needs to do the maths on that and see if you get ripped off. Or if you should somehow change tactics. Do you have any other friends or family in your life? Or some intelligent people to ask who to ask? I guess sometimes there also is some help groups for disabled people / people with depression available. Or organizations/charities who can help, ether with finances or interacting with the government, hopefully pro bono.
a) I don’t have any good recommendations. I’d just like to say that’s a lot of knowledge. Linux, networking, firewalls, the software etc. It takes some time to accumulate all of that knowledge. And probably reading more than one book
b) There are a lot of books about Android development. I’d recommend you visit a library or larger bookstore. They should have some, maybe you can skim a few pages and see if you like how it’s written.
Edit: Any maybe ask in the self hosting community and not on ask lemmy. ( [email protected] )