If you are buying or refinancing an investment property, you can use a DSCR loan to finance which doesn't consider your DTI or income to underwrite the loan.DSCR loans are based off of down payment, credit score and either actual or market rents so it helps to supercharge an investor's real estate goals and net worth.

If they want to develop the property they can just hire a builder no need to partner.YUP and like I said when you take in very low basis and then turn it into inventory most of the time a sale is the far better thing to dounless they are going to build and hold. 

Give lenders details about your income, work history, assets, obligations, and credit score when requesting prequalification.

My low-tech way for doing this has been to get a legal pad and write a different subject across the top of each page: Tenant Screening, Financing, Landlord Tips, Finding Housing, etc.  

We have low inventory and steady demand.

I didn’t have the best credit so my interest rate was put at 7.125% on a home worth $275,903.00.

If the LLC is an operating business..... lets say providing roofing services with annual revenues that are consistent or even better increase year after year for 10 years, lines of credit or other lending options might be available that aren't available for a new business. 

If you are pulling a HELOC or taking family money, leveraging credit cards, using personal savings it took you years to accumulate, whatever the source of money is - unless the source is endless - start small. 

or should I put down as low as possible?

We've seen a large influx of OOS investors over the last few years due to the low price points and ability to actually cashflow, while still seeing appreciation over the long haul (I don't think many primary markets check all three of those boxes with the current state of the economy).