First Time Landlord - What to do leading up to and on Day 1

[Robert Gandy]

My wife and I are in the process of acquiring two four plexes next door to each other. I have a general idea of how I plan to take over, but we need help with the process. I plan to have an estoppel agreement and standard inspections done during the due diligence period. My assumption is that at closing, we take possession of keys, security deposits, transfer any warranties on appliances, etc. Before purchase, I will develop a standard lease to be signed once taking control. My questions are:

Is it best to go month to month for a period when inheriting tenants? 

What other systems should we develop before tenant introductions? (P.O Box for correspondence, Google voice number, identify potential contractors/handymen?)

Any advice is appreciated, and thank you in advance.