I want to be able to figure out what a unit will rent for and from looking at numbers it seems the rental price is the biggest factor for ROI.

As it pertains to PM, you will want to factor in the cost of management whether you intend to manage the property yourself or not.

Size is not a factor it is the approach to the business that differentiates Professional from Hobby.For any one that does not like the reference to Hobby all you need to do is adopt a professional approach to the business and in dealing with tenants on a non personal level.

That's the main benefit for sellers.

My main topics I can help you with are turnkey investing, out of state and so on.I’m familiar with dfw, Raleigh, etc having lived there.

The biggest factor though is making sure you have a great management team, and if you're buying from an actual turnkey company, make sure they do solid work.

I just got a call from my realtor that said we have a buyer for one of our properties in Illinois that is looking to make an offer, but said they are hesitant because they feel they will have problems with the FHA len...

Some of the small towns only have one main employer and so the concern is if something ever happened to it then there's no reason for people to stick around.

is it Main and Main?

I'd say probably the main difference is that condos are usually cheaper than houses.