Glad you have heard good things. You have joined one of the best communities. If you have any issues or need general help with arma 3 just hop onto Teamspeak and people can help you out.
Also there is lots of guides on the forums so make sure to read them.
Enjoy your stay! If you have any questions/issues drop a member of the support team a message on here/teamspeak or pop by on teamspeak for a chat! Goodluck!