I’m only 20 years old and credit isn’t all that good.

I would then shop around for different hauling companies to get the cheapest price you can and i would check into if you need dumpsters or not, you may have to pay your own hauler but may still be able to put it in garbage cans. one thing you should look into though, if you now have to pay separate for garbage removal, make sure you get either reduced taxes or some kind of credit back every year from the town for the change. i know the town that i live in does that with commercial properties.

We were all set to close on the sale of my flip until my buyers lender decided they needed a few more conditions cleared: It is a high interest (8%) jumbo loan with 10% and low 600 credit (640 maybe?).  

I have no credit card debt or any other debt (ie car  payments, student loans etc).

So glad you've already plugged into the Bigger Pockets podcast - that was a huge source of education for me when I first started.If you haven't already, I would recommend finding a real estate agent that you trust, and also start talking to lenders (banks, mortgage brokers, credit unions, etc.)

The interior doesn't look like it has major damages as in the walls are intact, a bit dirty, so needs some repainting.

I'm fairly certain this is how the major list providers (ie list source etc) source their information. 

Seems high, but I don't know the CDA ratesI'd expect that you're the property manager considering you live there, so that's good money to youI'd expect since you're living there you perform majority of repairs/maintenanceI assume the units are separately measured for electricity, is $145/month for one or both units?

I am currently self-employed, have a down payment to invest and good credit. 

Wow I certainly overlooked that major fact!