You have a good plan so far. Your thinking cap appears to be screwed on. Evaluate the capabilities and duties of the on site manager.
You are the new landlord, you are the boss, you set the rules and expectations. You have to decide what’s the highest priority (to fix or improve), what’s next, and what’s after that.
#1 job of the on-site manager is to collect the rent. If the rent isn’t coming in, you’ll have to find some way to get the rent due or the whole thing is a big waste.
#2 you want “eyes and ears” on the ground telling you the real true facts and what’s going on. How did the cleaning crew do? Did the plumber show up? Are there any resident complaints? Did the trees get trimmed or does the sign look good or whatever improvement you’re considering, did that get done according to your plan?
#3 you want someone who can be a “cheerleader” for the community, greeter, a friendly face that knows all the residents and their quirks and habits and exceptions to rules (always should be in writing in the tenants file of course). Personally I think exceptions to a general rule are fine as long as there’s a reasonable reason on file. Head of the phone tree for communications.
#4 You want someone who can sell your empty lots and increase occupancy** this is a big job!
#5 You may want/need someone to deal with the local government, the utilities, authorized to spend money, etc. This costs more, or you can keep this responsibility yourself.
#6 emergency - who answers the phone when it’s an emergency? You’re in a different state…