I am not familiar with work you do, but I would recommend looking if you are qualified to invest into Solo 401K.

My point is that each one of them requires a higher level of skill and a higher level of risk. 

Be sure it’s recorded with the city and state and done with a skilled re attorney who -has done these -in your state .

Ask them what you need in order to qualify. 

Are income sources like capital gains excluded from qualifying for a mortgage?

You either need to learn more or have a qualified real estate agent help you.  

Also, it may be a challenge to fill the park with more qualified candidates if it's in a C type of neighborhood.

It could be renting out the extra bedroom to a friend, etc.If you can't yet qualify for a loan, and let's say you are renting a home/apartment from someone, and you had an extra bedroom, you could ask your landlord if it'd be OKAY to rent out the extra bedroom to someone, while you live there as well.But if you could get someone to help you get a loan to begin with, I think living in a duplex or a home and renting out the other sides or bedrooms, would be a GREAT way to get started.For now, dig into all the awesome resources on this side and LEARN as much as possible!

I thought i would qualify, but it seems i need to find a self employment job.

Real estate investment is a different animal, that may require special accounting skills.