I'm broke as a joke but I have good credit how do I get started 

I make sure I screen each potential tenant thoroughly (background and credit checks) and require references.

@Elan Adler do it as a token of appreciation and a pay ahead for other folks that search  BP agents and realize this.The decision to pursue this property isn't terrible, but I think it's for different reasons.

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

There's a few different ways to focus on a lower rate such as with house hacking and making the investment your primary residence, requesting a significant closing credit from the sellers for standard rate buy-downs (which I've had great success with recently), or utilizing lenders who offer short term rate lowering solutions such as 2-1 rate buy downs (again, ideally paid for by the sellers).

A line of credit won’t commit you to a monthly payment unless you use the money, so you can avoid paying interest when it’s not in use.

Instead, you could explore pulling equity out through a home equity line of credit (HELOC) or a cash-out refinance.

No social or credit pull needed upfront. 

Private lenders tend to focus more on the value of the asset or project rather than your credit score or financial history.

I did find It should result in a 2.5 to 3.5 kw system, net cost around $5k after tax credit.