@John Colagross
Good Job on being financially savy and having margin in your life! Do you have other savings? What's the 401k or IRA look like?
Well I might be a bit of a contrairian here on this site but I love having equity in my homes. Full equity is even better!
However with that said finding seed money to start is so important.
What I would do in your shoes in find a local credit union (or bank) that would do up to 90% ltv HELOC and Barrow the 45k they would give you.
Then I would use that 45k to get on the BRRRR wagon. I'm not sure what price point your looking at but in Alabama I assume that 45 k would just about pay cash for a starter rental. When your done reahbing it you would want I. To be worth 70k+ range and rents north of 750 or 800.
Don't deal in price points or rents lower than this as they are usually duds. The goalin the next few years would be to get to the $1000+ per month rental Range as that is a better place to be.
BRRRR is such a powerful tool.
What I like about the Line of credit is that it forces you to buy deals that will have enough equity to get it all back (via refinancing) so you can pay off your line and do it again.
Finally, good job on having a goal of 4 properties. If your crazy out of your mind determined, I'm sure you'll have them bought and making you money in the next year or so and off to a great start on your first 1 million income producing net worth.
Good luck and remember to enjoy the process!