I live in Phx,Az , where should i apply for a mortgage loan first at my local bank (wells fargo) or use a broker, a lot of people here tell me to start with my bank as they have all my info, if i get pre approved anywhere i wouldnt be committed/obligated to go along with the deal right ?

Pre-offer, it's reasonable to expect to be able to get a rent roll and answers on any recent improvements.

As @Bruce Lynn highlighted, you'll want to take advantage of any time you have now to start taking your pre-licensing courses and exams so you can get started right after graduation.While you're doing that, I'd also recommend reading/listening to Hyper Local, Hyper Fast agent by Dan Lesniak.

One thing you might want to focus on now is getting pre-approved for financing if you haven’t yet—it can give you a stronger position when making offers.

We pre-screen all tenants and they must qualify. 

I have remodeled the unit completely prior to putting it to rent, including addressing pre-movein readiness checklist I was given by RL after they walked through the unit (small list of punch items like toilet paper holder, cleaning unit, door stopper etc.).

I've been looking at buying RV Parks, Boat Marines and or Mobilome parks, I've read that SBA and HUD do have loan programs in these areas.My question is who do I contact to help get the ball rolling and pre-qualification. 

A short sale is basically a pre-foreclosed property, and the sellers Broker can walk them through obtaining a short sale approval with their financial investor/mortgage company… the seller is not liable for paying the broker or any additional debt that has been agreed upon by their investor/mortgage company, including the Broker’s commission.  

I look at it through the lens of: 1) If I contribute to a pre-tax account like a pre-tax 401k, Traditional IRA, SEP IRA, I get a tax deduction, but now I'm in a partnership with the IRS, but I don't know what I will have to pay them later on in life when I start pulling money out (that is because when you distribute you pay taxes based on your effective tax rate at that time, which can be unknown). 2) With Roth accounts, (Roth IRA/Solo 401k(k) with Roth component), I can get the taxes out of the way on the seed, so I don't have to pay on the crop. 

I can’t stress enough how important it is to stay focused and avoid some of these common pitfalls early on.Quick thoughts:Find the right Realtor – Make sure they’ve got some skin in the game with househacking or investment experience.Budget = Game Plan – That pre-approval is your marching orders.