More traditional things I would suggest, billing back utilities, charging for pets, upgraded finishes to increase rents, charging fees for things like storage or extra parking.Authors I would suggest Ken Mcelroy and Dave Lindahl.

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. 

Thank you everyone for your replies - it all sounds like solid advice:I understand to the professional real-estate investor this might sound like a nauseatingly safe strategy but I am a novice and admittedly would like to play safe while I learn the ins-and-outs of the industry, being a landlord, maintenance, renovation, regulations etc...

We do not utilize any lead generation services like Thumbtack or Homeadvisor because the ones looking for quotes on those sites only care about who is the lowest.

Student Rental (4BR/1Ba) - $90,000 List PriceOffer: $80,000 purchase price, 3% seller paid closing costs, 20% conventional financingCash Outlay: $20,000 ($16,000 down payment, $4,000 rehab)Rent: $1,240/mth Mortgage Payment (P&I): $344/mth ($64,000 @ 5% interest, 30 year am)Taxes: $133/mthInsurance: $150/mth Vacancy: $112/mth (9% - playing this conservatively)Maintenance: $75/mthCapEx: $125/mthManagement: $149/mth (~12% rents collected, conservatively assuming full occupancy)Utilities: N/A (covered by tenants)I like this deal for a couple of reasons.

I also had degrees in Mathematics, Computer Science and Physics (minor) and thought that if he could execute, he would own the industry. 

One note, if you pluck those trades out, it will be a fiasco unless you hire a contract/project manager to overlook your side of things, I would pay 5-10k for the cm/pm instead of the whole 40k, this way you save 30-35k AND have someone on your side to protect you from unauthorized change orders or COs that are of industry standards.

A seasoned real estate attorney can make sure the right deed is being utilized for the transaction (i.e. warranty deed or special warranty deed). 

I asked him if he could help pay for utilities, internet and Netflix. since his occupancy was sure to rise the utility bills.

Location is fairly good, land is on a major rd and the back part of it connects to an established neighborhood with older brick SFR’s All units a tenant owned, utilities aren’t included and overall condition of the park is on the low end.