The list of provided services will be available in the Athlete's Welcome Letter of each race. The Welcome Letters are downloadable in the information section of each event in the “Calendar & Results” on data.atsx.org once you have successfully registered.
Prize money and all winnings are determined by each race's event organizers.
No, you must choose which country you wish to represent. You must provide valid citizenship of that country at the time of the race. Changes of nation in the system are possible with the confirmation of corresponding valid documentation.
Refer to Sponsor section of the Athlete's Rulebook.