I'm not sure exactly what you want to know. Try asking specific questions.
One thing that many people overlook when investing in the US market is the currency risk. 'Experts' say that the dollar will get substantially weaker against the Euro in the coming years because of the amount of money the FED is printing. To be honest know one really knows where the dollar is heading .... but to hedge your bets, I wouldn't send all the money in the one go and probably choose a time when the dollar is weak (i.e. €1= >$1.50).
If the exchange rate goes against you (when you go to bring home your cash), it can seriously erode any gains you made on the stocks themselves.