No one knows, even the people saying they know might not really know. 

I have succesfully done this on IGMS PMS software.I would also make sure your email is listed on their VRBO account. you will then be able to get inquiries and messages on your email account so you know when someone messages.

Do you have experience and know the cycles of your market so you know the best price?

I've done this with my properties because I'm well known in my small town and don't want people to know what I own.

I'm surprised someone verbally told you you can convert back to a duplex and didn't tell you that you must get permits.from what you are describing it seems the town gave you a hard time because you didn't get permits, I don't know that you have any legal standing to go after the town,  again, I am not an attorney 

I don’t know whether or not investment in Detroit residential property will make you rich.  

All of the above, but in a smart order:Get Prequalified First – Knowing your financing options upfront helps you move fast when you find a deal.

I know the larger companies around here were charging up to 25% but it will probably vary no matter where you are at.  

I highly recommend a well-qualified REALTOR who works with investors and knows how to help you best.7.

Congratulations - keep us updated and let us know how it goes!