In this area, a posting to our multiple listing system usually results in about 10 inquiries the first day.  

We're collecting the first and deposit upfront, but letting them pay the last month's rent on some type of payment system so they can do it over time.

what is the water piping, drains, electric, sewer and heating system condition?

@Lamont Marable find an investor friendly agent and you can get all of these questions answered for free from Someone that wants to earn your business.Adding units is extremely difficult if there is not already a fire suppression system in place or fire walls present.

@Jesse Stein @Allen McGlashing you guys should be setting your standards much higher...even top producing investment real estate agents should be responding quickly (within 1-2 hours)...and you should have a system setup for offers...they should go out within an hour or two of your request.Stop working with agents that work at big brokerages like Keller Williams or HER...I know there is a bunch of these good ol' boy brokerages out there, but they are tools of the residential industry...not investment specialist for local markets...find a small local firm and start interviewing agents

I added two more dwellings with septic systems.

You'll want to have a clear system and rules for how folks are billed.

It requires research into each systems useful life and future value calculations.

Tax, bookkeeping, sorting receipts from a shoe box into a usable backup system, phone calls with questions, etc...[2] When will tax return be done--before due date or after due date.[3] Are there blackout times when question calls cannot be made.[4] Will you need to buy (pay for monthly) any software.Good Luck!

I have a very ambitious goal, and I will need to break it down step by step and acquire the necessary resources and foundational systems to be able to scale.