I am 14 years old and I am running a small ebay business making about 300 dollars a month and growing it (my goal is a thousand dollars a month). In a year or two I was wanting to invest in a mobile home to rent out t...

It's not 'sexy' advice, but it's good advice. 

You gained these skills and knowledge in your teens and early adulthood working with a renovation contractor so you “did it all” from demo to roofing, and nearly everything in between.

F to C- youi want mid teens to above 20.A and B depends on where your at.. out here in our area those will trade from 3 caps to 6 caps.

I know big multis are sexy right now.

Your original CoC return doesn't sound so sexy anymore right?

If the room in question was designated as a bedroom, I doubt parents would want a young child sleeping below them on the 1st floor, especially with the access via the mud room; however, maybe parents would allow their kids who are in their mid to late teens to sleep there?

The broker has it valued with a CAP in the high teens on projected NOI of ~$250k.  20,000 sf with approvals to build an identical 20,000sf on the 8 acre property.  

., insulation, sealed ductwork) instead of sexy (solar, granite countertops).

Flips are the sexy part people see on HGTV and other mediums.