If the mobile home is in a park that is amenity rich and a great location, then it would rent for one price, and in the blighted part of town, still another.3) The age and condition of the home is huge.

Figure that out first (is it really going bad or are you subject to "getting older everything was better when I was NN y.o." syndrome), find the reason for the decline and then decide if you want to stay in the house or move.I wish it were as easy as the "everything is getting worse" due to older age. 

@Lara Nicole the age of the house is not as relevant as many people think.

You just gave us all your 'elevator pitch' here so I would just have that prepped and ready to go if you come across anyone giving you grief on your age. 

You could conceivably divide the buyer group even further such as first-time buyers, age, location, etc.

Average age of the homes?

I’m 18 and my goal is to get my first rental before I turn 20, but I’m not sure how I could go about it like if course save up money but how could I ever get a loan at such a young age to finance it?

I know some people your age who are killing it.First off if you are going to partner up make sure you have a thorough agreement in writing spelling out roles, investment, profit splits etc.You will need a title company or closing attorney to close your deals.

many in real estate sales never really learn proper technique its a learned skill.. there is a reason there are top performers in real estate.. they simply have better skills you can learn those skills.I was taught them at a young age and by some very sharp salesmen..

You should build up reserves, 5-10%, from rent to meet those expenses depending on the age of the building and condition.