Those answers are what you should have known before buying but now you have to maximize your rent and attract a quality tenant 

This practice is less than attractive, IMHO to any newbie investor; especially when the discussion was to have, at a minimum, 3 separate series, 1 to buy and sell (flips), one to hold (rentals), and one to handle operations(PM or day to day OPS).  

I take great care of my buildings and market them as per allergy free, and attract tenants that don’t like pets (smell, noise, etc. ).

I know i can get just as much rent from a $100k house but i want you get places in the $150k range to hopefully attract better tenants.  

If I can make the lot rent and the monthly cost of the home close to what people pay for a similarly sized rental then its an attractive deal for many.

I upgrade to 200 amp, insulate, replace dated light and plumbing fixtures, replace the roof if necessary (or budget to replace it if it has a few more years on it--I just don't wait until it starts leaking), fix any drainage issues, replace windows (maybe 75% of the time), make sure doors/hardware work properly (I install hinge-stops and/or those round plastic bumpers that affix to the wall so I never have wall/door damage), limb up or remove trees, and of course give it a thorough cosmetic upgrade so it attracts good tenants.

You will have difficultly attracting a good renter in a high crime area.Also busy streets can be a problem for residential houses (SFR).The other more subtle issue is over improving a house based on the neighborhood.

Separate properties are generally more attractive to retail buyers, since it is a limited market interested in the live in a unit/rent out a unit if they are the same property legally. 

My current role invovles analyzing loan profitability, assesing portfolio risk and designing new process/methodology to maximize profits for my employer. i work scpecifically with mortgages, so i have seen and gain a deep understanding on how a mortgage work and the profits behind them. that said, it made me realize that if i couldn't be a lender i could probably an investor or whosaler to maximize my cash flow. i plan to be financial independant by the time i am 45. i am now 32, so i only have 13 years left the clock is thicking!

Check into it, it's very durable, easy to install and they are coming out with some very attractive wood look designs.