It makes me want to quit... because I don't have a good system and stuff is EVERYWHERE....Every month I take pictures of the rental checks on my phone or any check related to the property management and put it in albums for each according property....So where normal people have funny dog pics, I have a million checks on my phone.... and every month its a disaster scrolling through pics of checks, Let alone the NIGHTMARE of tech issues in sync'ing my devices and images getting passed around/deleted etc etc.....I'm sure no normal property manager does this.... what is the best system?

Bank transfers are typically online where the tenant sends funds electronically to you if your bank offers the service.  

Cash, money order, electronic payment.

I have one door and my primary residence that I rent out the upstairs.In my rental over the last year I have had the following issues/calls:In the first week (when I think you will get the most calls from tenants):Toilet seat was wobbly (It was-very easy fix)Toilet seat wasn't flushing (plastic trip device broke. $10 fix)After that I had 2 calls over the course of the year:The AC unit wasn't draining properly and was leaking out into the house.

Even a text from them saying they have vacated should be fine for legal notice, as electronic communications are accepted in most states now.If their phone is still working, they should respond when they see you can keep charging them rent.

I would like to go electronic but my tenants are resistant.One tenant banks with Chase (as do I).

I don't just want the rent to come in automagically and electronically, I want the application fee, the security deposit and any other $ to follow the same path.  

Another example of a reasonable accommodation would be if they are in a wheelchair and they need an assigned parking spot close to their apartment, or a bar installed in the bathroom to help them get in and out of the tub.So, you can't charge them anything for the service animal, because they are not a "pet" they are a medical device, basically.You do not have to accept an animal that would create a financial hardship - for instance if it was a pit bull and you would lose your insurance if you had a pitbull on the property. 

If the place is indeed empty (no food, clothing, medications, personal electronics, etc.), and the father himself has turned off the utilities, it's considered abandoned.

That way the tenant will have a working detector so long as they do not confiscate the batteries to power their electronic toys  :)