The era of "everything prints money on Airbnb" is LONG GONE! 

Crossing the lines may not provide proper liability protection.Personally, I just kept my SF rentals in my name and got excellent insurance coverage, $500K per property plus a $2M umbrella.

If the price was right on Turn-key maybe, but probably more of the fixer-upper that can be leveraged later on for additional property or sold for a nice profit. 

Just a builders risk policy if you are doing an extensive rehab on the property and then a landlord dwelling policy when the property is rented.

One tenant is behind on rent and has still not paid December rent.I’m seeing mixed things online but looks like I have to file something by the 31st?

Just acquired a property in a small North Texas very rural town. No building inspections or permits exist out there. The previous homeowner enclosed the back porch and was using it as a 3rd bedroom. By doing this the ...

I need more advice
Just now I suddenly had an idea, the land left by the LA fire and SB-9 (SB-9 allows single-family residential lots to be split into two lots)
Is this a good opportunity?

So advice to get the house against him and he will move out on his own is HIGHLY unlikely.  

Begin by educating yourself through books like The House Hacking Strategy and podcasts like BiggerPockets, and join online communities for support.

Hey man, congrats on the first deal!