An International Tax (I/T) Attorney is the best place to start as you stated that you are the point of others, your team could help with the fees of which will not be a great number for all.
Most International buyers get off the plane stop by the sales office and 'BAM' they own a Holiday Home, then they find out the future problems, remember the sales offices are in it for the sale of the home. A Realtor is about the sale and the relationship created between you and themselves for future business, we want to direct you to the right sources so you will recommend us to any future buyers you may know.
International Buyers tend to be in Holiday Homes for long term investment (and the ability to use at will for themselves), due to prices now your long term investment should trend up, the FIRPTA law comes into play when you sell the home.
Again see this link http://www.irs.gov/businesses/small/international/article/0,
or best to talk to an I/T Attorney.
As for the rental profit you will need to address this again set this up with an I/T Attorney.
Why do I point you to an I/T Attorney? He will listen to you and give options, and when you explain you are a possible group he might have give you more options.
I have an insight into Holiday Homes as three of our family members worked for the premier builder of these homes in the Orlando area.