Firstly, don't act as nervous as you seem to be. There is a certain amount of charm that comes with humility and being arrogant is not good either.
If you've been talking for quite sometime, you obviously know each other somewhat well (sense of humor, likes/dislikes, etc), so most importantly...be yourself (or at least the guy that you've been over the internet). If she has gone as far as to invite you, she must like the guy that she's chatted with a little bit.
Don't get your expectations too high, because you will likely come across as pushy. Just go, enjoy the country, enjoy your trip and, hopefully, enjoy your time with this girl.
If you've been talking for quite sometime, you obviously know each other somewhat well (sense of humor, likes/dislikes, etc), so most importantly...be yourself (or at least the guy that you've been over the internet). If she has gone as far as to invite you, she must like the guy that she's chatted with a little bit.
Don't get your expectations too high, because you will likely come across as pushy. Just go, enjoy the country, enjoy your trip and, hopefully, enjoy your time with this girl.