Search BP --- here is one...https://www.biggerpockets.com/forums/61/topics/827155-starting-an-llc-after-two-propertiesYou need to have LLC's registered in the State either as a domestic or foreign entity. 

Have a plumbing professional put together proposals. 

However, I’m wondering how cautious I’ll need to be with buying homes 100+ years old, or if I should avoid them entirely.The issues I’m most concerned about addressing are:-Knob and tube wiring-Foundation issues-Plumbing, cast iron pipes, galvanized piped-Lead based paint-Asbestos-Old single pane/drafty windows-Old HVAC systems-Roof-Historical preservation rulesI intend to leave the work of fixing most these issues to electricians, plumbers, roofers, etc.

Additionally, if you buy something super cheap, there's a good chance it may need a new roof or plumbing etc. 

Plumbing and wasteline they had to run out there and that was the toughest part.

I just did this with tenants that had a somewhat rough looking background... one had a 6 year old eviction, the roommate had some sort of domestic issue... but not drugs or criminal.  

It's your plumbing.

I’ve had good luck with Cody Allen with Rollins Plumbing.  

It needs everything including exterior work, plumbing and electrical. 

I’ve had our property managers go through every contract, including landscaping, plumbing, and electrical – whatever is currently being paid on a monthly basis is being reviewed.