You're using a company to manage tenant phone calls/inquiries and then send in vendors for repairs.

There are phone apps that help with that. 

Hi Everyone, If I only have tenant's birthday, driver license number, and phone number, can I still have a collection agency to help me to collect the delinquent rent?

Some of my clients in this scenario literally just pick-up the phone, tell the seller of their specific property they are interested and they are well qualified, and see if there is some kind of fit. 

Instead of wasting 20 hours a week on your phone or TV, work a part-time job to accelerate paying down the debt and saving. 

We provide free medical coverage, free food, free housing, free cell phones, free internet, free clothing, free transportation, guaranteed employment for any/all who ask (salvation army), free furnishing of a home, free temporary housing, free shelters, free free free......

Also, when it comes to negotiating the rent: - Should I ask for a phone call or virtual meeting to discuss the price?

Extremely communicative and Bob spent time over multiple phone calls answering specific questions I had concerning the deal.

They had no interest in the mobile home; they just wanted the property so another family member could build a home on it.

You GOTTA use WIDE-angel photos. many phones have great features for this now, or there is app's for it, or lenses, lens adapters. get something, anything, or buy a new phone that does it.