Thank you Alex for rapid reply.
IDEA: Start with the European Union. It has different tax and other laws than the US but I think the regulations are quite synchronized, so I believe it is enough to negotiate with one country, like UK that seems to have many members, and it will be valid all over the EU.
One problem is income tax declaration if the income is considered American. Many Europeans, would hesitate to take incomes, especially if they are small, from the US. This is because, once registered, the US tax authorities will require Tax declarations every year for the rest of your life even if you dont live in the US.
Therefore, I suggest you create an European Golf Tour for Europeans, located within the EU. There are simple rules for handling incomes within EU.