Elderly owners mean they can't care for properties and moderate income folks have difficulty in maintaining properties.

some of the books you mention are great but are big picture idea books, and you may be thinking ...how do I select a place, inspect, buy and rent it (advertise, screen and select tenants, maintain it, etc).

Make sure you have their cell phone numbers as texting deals out is more effective then emailing them out.

Being that you are not in a community property state you will be required to maintain a profit and loss, balance sheet and prepare a 1065 US Partnership tax return.

The neighbor who let me in said that the park maintains the trees. 

Also check existing leases for effective rent.Seller can claim 950 a unit but gave first months rent free.

The slight extra they are allowed to hold is to cover annual tax and insurance increases that they can't effectively predict and budget until that year's payments go out which is too late to collect them. 

Most effective means to advertise and generate leads will take some money.

The plan is to sell enough of the notes to maintain liquidity, and hold the rest.

That filing could affect the recent purchase because its effective date would be the new date of filing.