Other than the lease agreement, pet addendum, pre/post inspection and rental application forms... what else would be necessary to be prepared for my first rental?

Talk to neighbors (landlords and tenants) to find out what they pay/charge for rent, utilities, pet fees, etc..Talk with utilities to get last year or 2 of actual expenses.  

More traditional things I would suggest, billing back utilities, charging for pets, upgraded finishes to increase rents, charging fees for things like storage or extra parking.Authors I would suggest Ken Mcelroy and Dave Lindahl.

We don't allow smokers or pets as we just don't want the hassle. 

This is a no-pets property, clearly spelled out in the lease.The neighbor contacted me to complain about a dog that's been in the unit for about 3 months & says it belongs to the tenant's family that has apparently moved in. 

I am changing from my no-pet policy because of long vacancies, and I get many requests from would-be tenants with pets. 

Pet rent?

Its not cigarettes or pets or body odor or mildew or even simply dirty people.

If you never gave him an EMD and the contract doesn't say you "need" to, then I imagine you don't "owe" it...With that said... this is my biggest wholesaler pet peeve.

Think of all the things that could go wrong and see if the lease addresses them: unauthorized pets or tenants, early termination, security deposit, lease violations, late rent, eviction, lawn maintenance, parking, etc.5.