What @James Wise said.Plus, 60 amps, that might be old 110V service and those old fabric covered wires.The flickering and surging might be the OLDEN DAYS fabric wires arcing inside the walls (a fire on it's way to starting).Even if the outlets have 3 prong holes and you see some ROMEX, it doesn't mean they redid the whole system with ROMEX, there will be hidden from view junction boxes that might still have old wire in them, or old plastered over live wires.Fix it quick--flickering and surging is not a good thing--it's very dangerous.You may be forced by law to bring it up to current code, GFCI Breakers, etc... ($$$$)And make sure the smoke detectors are up (not expired) and working properly.I shudder to think how you will feel if someone burns to death in there.

In addition, you need to account for other things such as vacancy, maintenance, and capital expenditures (like a new roof or heating system).

This could probably be lower if all items are in near new condition, but I have had $6k in gas line repairs for gas that couldn't be smelled, but the utility transfer caused a pressure test that found multiple leaks throughout the system.  

I know I could go drive around and write addresses down, but I will only have 2 days a week/ 3 hours at a time to do this, with my busy life style  I think batch will probably be best because it already has everything integrated into their system.3rd. when using services what works best? 

It's pretty much a guarantee that you're going to need to replace things like HVAC systems eventually, it's best to have money in the bank to fund those fixes!

The alternative -- setting up a system for finding off-market deals -- is riskier if you're just starting out and less likely to produce results without infrastructure and significant capital to feed it. 

When the structure is serviced by an individual sewage disposal system, the applicant shall have the existing or any new system approved by the department of environmental management.

I listened to podcast episode 508 with Carrot.com founder Trevor Mauch and 510 with Sam Carpenter about systems.

heather and brandon turner's book on managing rental property is a good one that helped me a lot with systems. sometimes you do not know what you do not know until you get started and can create systems that work best for you.

The newer ones continually have repair issues, mostly driven the electronic controls and complex systems to squeeze out efficiency.