You just took an excellent first step. You found and actually posted on Bigger Pockets.
You posted a lot of information which needs more detail and asked a lot of questions.
75k for a property that rents for $523. This is a bad investment. I don't know what you had in it before but you probably just financed it into a cash flow negative property. Sell it before it hemorrhages more from you.
Do you have a property manager for your 4 plex in Colorado? If you do, fire them. If not, get a property manager. Either way, you need a property manager. Start a new thread asking about PM's in you town.
Good job getting your license. Learn to be an awesome agent. In the process you will learn your market inside out, recognize a great deal and have the opportunity to swoop in early.
Your properties being in different states has no bearing on your financing, its your track record. You have a cash flow negative property, a 4 plex that's only 3/4 rented and a new career. Cash? Credit score? Debt to income ratio?
Next steps - sell bad investment. Show you are an affective land lord and turn your 4 plex around. Make money as an agent and learn your market. save every possible penny. Build your credit score. Make your debt to income better by paying down debts and getting rid of the first property.
Your best first step was coming here. Bigger Pockets is an awesome resource full of professionals willing to give their advice for free.