I'm always looking for advice and criticism and I plan to be more involved with the BP community. 

I agree with the previous responses, finding a trustworthy HVAC technician is critical to running a successful rental business.

I think its an excellent resource for busy working professionalsHaving said that working with a good turnkey provider is absolutely critical.

@Louis Siano Time is always critical however you could lose time during closing If a fix and flip pro comes in and runs his/her numbers and discovers your numbers are way off.I’d recommend making good friends with a contractor who can give you a “rapid quote” on repairs.

This way your equity even is giving you a return.Once your portfolio reaches critical mass, or you hit your target numbers or cash flow you can transition over to paying down debt to prepare for the final distribution phase.However, people need to retire, or go full time, at some point this is called your distribution phase, so when that time comes be sure the properties are paid off by that time to maximize cash flow in retirement.A great book on this topic and more is Gary Keller's The Millionaire Real Estate Investor.

I bet you'd fix that sink in a heartbeat.With younger folks (and us not-so-young Realtors), internet is as critical as electricity. 

Staying positive is critical to your success.

Of course, having good partners will be critical not just in finding the places but also managing them well. 

I also think it's critical to have someone who is an actual landlord themselves so they not only know the PM business but they understand what it's like to be an owner having to make mortgage payments, keep expenses low, etc. 

He doesn’t take suggestion/criticism well.