I will say that most property management companies are going to require you to sign a non-compete agreement that may prevent you from practicing management for 1-2 years after you leave the company (within a certain geographic area) and especially while you are working there, so it may be difficult to start your company while working for another company. 

I am planning on spending a lot of time at home improvement stores in my area but outside of doing this or hiring somebody to help me design a flip house is there anything else I can do that would prevent overspending?

If your relationship w/the tenant is good, as them to leave the refrigerator door open to help prevent mold.I would put out my For Rent sign though and start screening applicants. 

I would repaint it to prevent further damage. 

Having someone to draft effective contracts for you may prevent your being dragged into claims.

This has prevented them from being in a higher interest loan longer than they had planned. 

In the mean time I want to go in and at least spray to prevent the problem from getting worse and going to other units, but he won’t answer me.

If she prevents you from coming back in, some police departments will do a civil standby and/or come out and explain to your mom that she can’t just kick you out like that if you lived there. 

I wanted something with NO bunk beds and NO loft that overlooks the living area that is considered a bedroom (no privacy or sound prevention) also was hoping to find something with A/C, which most people say you don't need, but we spent a week in Yosemite 2 years ago and sleeping was difficult with the extreme heat wave that went through when we were there.

If Tenant wishes to use their own appliances, Tenant agrees to contact Landlord in advance to obtain prior written approval and instructions, as the removal and installation of appliances must be done with care to prevent damage to the appliance and/or building.