So essentially the land is just sitting there not collecting taxes. 

if you mean net like Net from collected rent  that could be pretty tough in 3 years unless you stumble into some unbelievable deals.

@Lydia S. about 20 years ago there were a lot of houses that had cracks in the foundation and owners filed insurance claims with their insurance companies to collect money to fix settlement issues. 

A LLC would protect you to an extent but also show as a red flag to landlords that they would not be able to collect as easily which could scare many off. 

As @Joe Splitrock mentioned, you need to be collecting enough money to account for the parts of the house that are wearing out but not costing you direct money every month - the roof; the water heater; the HVAC; the flooring; ETC.

Criteria that I’m hoping for are:- preferably no cost to landlord for subscription - rent collection possible (and preferably at no added cost to tenant - some have a 2.5% fee even for direct deposit)- maintenance requests - document storage (lease, receipts etc) Any feedback welcome!

, you don’t want bad neighbors-be careful when renting to pets and collect pet deposits/screen their pets, and check with other tenants that it is okay.

I'm starting out and already collected cash and some knowledge needed for my real estate investment deal.

As far as rent I would just make everyone pay electronically that way there is no need to physically collect rent and you can avoid those situations. 

The more paperwork you can throw in front of the Judge the better.Just be aware that once you win the case and have a judgement, you still have to collect, how are you planning on doing that?