@Forest WuRecommend exploring as many sources as possible to get referrals AND cross-reference them to get as much accurate information as possible.Check out NARPM.com, BP’s Property Manager Finder (BiggerPockets: The Real Estate Investing Social Network), etc.Also, encourage you to learn from the mistakes of others - by reading posts here on BiggerPockets about owners not having their expectations met by their current Property Management Company.

You said they are "from California" but now you are saying they don't have a social security number?

Apparently, Lester Bird had been instrumental in getting John Beck residence status in Antigua.  5 billion people and yet a small world.  6 degrees of separation!  

I'd encourage you to talk to a CPA before choosing a path.Since you are already an agent, the odds are good you could qualify as a real estate professional status (REPS) for tax purposes. 

I always say to go follow different people that offer STR masterminds/courses on social media, and whichever one clicks for you and has similar goals consider joining the group.

Pregnancy is covered under Fair Housing laws (familial status), so not renting to her (or treating her differently) because of her pregnancy would definitely be prohibited. 

This requires no money, minimal effort, and you can leverage your veteran status on the calls.

I would not accept until and unless I see evidence of cosigner's financial status in their home country. 

Up until the trustee sale (foreclosure auction), the home is still owned and fully controlled by the home owner.I’m assuming you’re going to be looking at off-market properties (since loan status isn’t something they advertise on the MLS so you likely wouldn’t even know if it was in default if it’s a listed property).So, in that case, you’d just negotiate a purchase agreement with the home owner and then take the contract to your local escrow/title company to open escrow. 

They are advertising quite a bit on social media.