I'm new to this, I'm disabled, and interested in real estate investing.

You like most other men in 40s and 50s will have some kind of disability so now is the best time to do this...dont wait, it will be your income if employers wont hire you because of age discrimination. 

The support from bigger pockets has been missing due to a disabled alerts button or something like that 🐯

Don't mention anything about his disability, including the drinking or that you are worried he will fall down the stairs.

They offer free industry certificate training (VCTP) and they also train veterans with at least a 30% disability rating the program is called Entrepreneurship Bootcamp for veterans.

You will get all manner of quotes, depending on materials and other factors- will you have xray machines, do you need center run power /water (i.e. dentist office) or do you do day surgery (will require automated backup generators IIRC), are your clients physically disabled, do you need chair lift, if you change an old building do you have to make it ADA compliant. 

One is in his 50s, on disability.  

We went through a rough patch when I was injured and was on disability and could not afford all the bills we had.

The tenants in my 2bdrm 1ba house are disabled.

He now performs side jobs and collects disability due experiencing mild multiple sclerosis symptoms.