I have a 2 bed 1 bath garden unit, I have this possible tenant who is interested, she makes about $3500 with disability and social services.

Surprise in this scenario means it pops up annually, rather than monthly/quarterly.

The home is currently rented for $3,000 a month with tenants in place.

Then a year later I plan to purchase another property with a goal to make me 5k a month in cash flow.

If tenant B is leaving at the end of the month, then that threat is gone. 

Her income is 3x the monthly rent. 

I'm in Los Angeles as well and I've snowballed up to 20 units in MO and TX (mostly BRRRRs).Since you're local, you should join our monthly investor meetup in Woodland Hills.

Or any other type of related service for rental property opportunities?

Realize at the outset that real estate will involve all different types to service, maintain, repair, improve, insure, manage and eventually sell.  

Some investors think I am crazy doing that and perhaps so, but I take other people's money seriously and even when the crap hits the fan (and it will if you do enough deals for a long enough period of time), paying back your lender is priority one in my book.Most of my deals for private money also include a balloon payment rather than monthly payments.