lastly, Cedar Rapids requires new landlords to register with the city and take a training class that will put you in the same room as many fellow landlords. 

The letter basically said she was a great tenant, if he (the landlord) didn't need to move back into the house himself she wouldn't even be leaving (the landlord was a military member who was getting out of the service), and if given the opportunity he would rent to her again without hesitation.  

Newbie pending landlord.Which sites/services would you recommend/have experience with for background checks and credit checks?

Costs to do business is always factored in to price of goods and services.

and what mailer service do you use?

I’m looking for a service that tenants can pay their rent online / auto payments.

This is sure to happen.What is needed is a quality white label service at a decent price point that is coupled with lead generation and legal support. 

Given that fact I am building a duplex, only one potable water meter will be servicing the property.

You must use the services of a qualified intermediary to handle the exchange and they must be in place prior to the closing of the sale. 

You can get service the same day by using what is called "nail and mail service."