One of the investments finally paid out and return the principle with over 10% ROI (more than the projected 10%).

I have several other properties that are two flats, SFHs, condos etc. some of which have 30 year fixed and some of these are paid off. 

Typically for a SFR rental these are paid by the tenant. 

My first piece of advice (and probably one you don't want to hear) is to get the credit card debt paid down before asking for a loan. 

They'd love that - getting paid to smash and break things.

Those expenses must be paid from the IRA. 

Once repairs are done, the paid rent is released to the landlord.

Park manager gets free lot rent 16 lots currently collecting lot rent for gross annual income of 42,168City Water/City Sewer Tenants pay all utilities besides water (water paid by owner)I feel that my expenses as listed in my rough numbers are very low. 

I am not an accountant but my understanding is that when you sell on contract you recognize any gain as the principle is paid down so this spreads things over several years.  

I am fortunate enough to be making fairly good money for a person my age and my goal is to have enough money and knowledge by the time I turn 18 to have a down payment on my first property and have it paid off as soon as possible.