help!!!! newbie looking for advice on first investment property

I have a auto body shop that is located in a D class residential area, it was own by my grandfather, he is getting up in age and he is passing it to me. he hasn't done body work in years, he just have been renting the place out to some guys he know for like $220 a month. the utility are still in his name also. my whole idea is to come in, change things around, do the proper things, have a actually lease agreement written out for the tenants, with the new rate increase and rules, there wont be anymore of the late rent payments, there will be a late penalty, the utility will be in the tenants names,I plan to put a security system on the property, I'm new to all of this , its my first property I'm open to advice, suggestions, ideas on what I should do.