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

For VA loans, here are some solid options:Veterans United (veteransunited.com)Navy Federal Credit Union (navyfederal.org)Caliber Home Loans (caliberhomeloans.com)USAA (usaa.com)Not sure if I can post a link here in the forum. 

In most of those cases, their broker took a high fee and the investor didn't end up with a great deal.Here are a couple of things that are a tipoff you are not working with a broker with your interests at heart (1) they want to pull your credit before having a conversation, or (2) they send you a long list of things you need to provide them before learning about you and your deal.The conversation should start with why you are interested in REI, then understanding your strategy to get there.

A business line of credit through your LLC protects personal assets, builds business credit, and may allow interest deductions, but it might be harder to secure for a new LLC.

Quote from @Daron Williams: I just invested in a tax deed here in texas it was a beautiful lot right on lake sam rayburn. i have it on the market for sale the only problem is you have to have two lots to build on.. i found the person that owns the lot to the right of me and there willing to possibly sale there lot the only problem is i dont have the money or the credit  to purchase it.

What is your credit score?

Those are people who have cash/credit and will lend to you if you have a good deal locked up. 

If your property is residential single-family owner-occupied in a good area, the buyer has good credit, made a good down payment, and twelve or more on-time payments have been made, you'll be in the lower range.Note buyers, just like lenders, won't go above a certain loan-to-value (LTV) ratio.

I've reached out to the gentleman that owns the large PM group in the area to see if he knows of any smaller PM that I can connect with and I also messaged my credit union to find out what my best options would be.

It gives you the flexibility kind of like a credit card that allows you to borrow a certain limit and withdraw funds as needed.