I don't want to learn bad habits early, so what can I do to improve my learning process? 

Leases usually specify something about that tenant shall keep unit in a clean, habitable condition, so no matter how long they live there, it should be a normal cleaning job when they leave.  

I have a bad habit of fixing up properties if I have money.   

I said if their maintenance person could not PERMANENTLY fix the problem, the next time they either needed to hire a real company or I would be putting my rent in escrow until they provided me a habitable place to live. 

There is nothing wrong with low income residents, just that it tends to come with different payment habits.

@Bill Gulley I looked at @Karma Senge 's RE investing goals and in there he had said he would like to owe 1000s of units in next 10 years or so.So when i responded to him about his carrier move question, in regards to Comm RE. brokering, I suggested: Instead of worrying about, brokering commercial properties for other folks he could just really focus on to take his investment portfolio from a Ma' and Pa's to the next level Gary Keller's book is sort of a how to book on evolving in to a large investor from the small time one's.For example, it includes detailed interviews, DOs/DONTs and investing habits of about a hundred highly successful self made large investors in the USA.

Its a great habit to get into, moves you forward and out of any potential slump.

(creature of habit)  

Beside them I would say First time renters, They do not have bad habits yet. 

Once the habitability requirement have been taken care of, you can use the remaining funds for other upgrades.This is my guy.