I'm an investor moving from Ann Arbor Michigan to Nashville (Mt Juliet specifically) and am looking for contractor recommendations for a general remodel for my new home.

R&M also depends on the age, current condition of the property and the quality of tenants.  

Your capex will depend on the age of major things on the property like HVAC and roof, vacancy will depend on the market.  

The notice of rent increase does not serve as a notice to terminate the prior lease (unless your lease has specific language otherwise), so you need to put that in writing (after getting legal advice and support) before you can start the eviction process for non-payment. 

Not in the Northeast , I’m in L.A but I am sure you will find a ton of investors from your area .BP Does have forums for specific local areas too this is the one for New Hampshire . https://www.biggerpockets.com/forums/571-new-hampshire-real-estate-q-a-discussion-forum

Anyone else over in the North East, specifically New England area?

There may be a 25 - 40 year difference in age of the homes.

Also what specific dd services would you want?

Specific tips will depend on the nuances of your market, property type and property and I would recommend talking specifics with local pro's (brokers/investors) to get their opinions based on the property type/market you're focused on. 

Would love to get some opinions on self managing vs. hiring a PM, specifically in the Boston area.