There is quite a few threads in both the newbie tank and the gear discussion section that will be of help. This thread >
is about bigger milsim events but it may give you some ideas for kit that you will need.
If money is no issue and you are looking for a high performance gun out of the box you can't really beat a Fight Club Custom. Sure they are expensive but they are hard to top in terms of quality and performance. I don't know if I would suggest one as a first gun but the review thread for them might be of some interest to you.
I would suggest you contact another av rep in your area. It might also be of some help to set your location and maybe some other information on your account.