I want to make sure she is taking care of my house and following my rules but I also don't want to be one of those landlords that is constantly bugging the tenants.

These are people that teach me things constantly and I own a turnkey company in another state. 

I am not saying you have to work on your campaigns 24/7 365 like your life depended on it, but you need to be tracking what works constantly, testing a lot, and optimizing every aspect of your funnel. if you won't take the time to learn at least the basics then please just delegate it somebody more qualified.The main goal of your campaigns is to generate qualified leads that turn into deals online. the best way to do this would be to run ads through a funnel. 

YUP  if your goal is to constantly low ball and continue to grow your portfolio getting your own license could be the right move.as one who has owned a few brokerages..

You don't want them to be so busy that you're constantly working with their assistant.A realtor like this will be absolutely invaluable, and will be a great resource to connect you with many people who can help you with your future endeavors.

I use to put bandit signs out during the week and I got hate calls from various city officials constantly, not to mention they took my signs down and tossed them.What you need to do is put the signs out Friday night after 6pm and pick them up Sunday night after 6pm.

I am constantly updating my linkedin to include mostly investors and banks (since I am a note investor).

I'd even say a good 25% of my bookings are accepted and paid before some of my competitors even bothered to respond to what I'm sure are inquiries from the same person that asked me about rates for a particular week/month.And once on-property, if you're not checking in, being pro-active about making sure they're happy or spot checking occasionally to top them up on towels or what not, you may see your ratings tend towards the non-5 star.So to sum up, I'd say if you're coming from a long term rental mindset, the attention to detail and constant communication would be the biggest shift in mentality.  

If you constantly leverage everything you have, you need to do something with that money - either stick it in a checking/savings/cd (dumb from a financial point of view), an index fund or stocks (good but a different type of risk), or continue investing in real estate (also good but also risk and work).

I have had experienced investors with 20+ years tell me they would never touch multi family, and others tell me they would never touch single family.The folks that don't like multi family say that it's because their turnover is "constant" and the expense ratio is "substantially higher".