Go here:
http://zone.msn.com/en/flightsim98/arti ... ookie=true Login/register then login.
It will d/l some msn gamezone stuff, then scroll down the list of the different flight sims and select:
Flight Simulator: A Century of FlightFree flying
Then look around at the different hosted sessions, choose one that looks interesting, i also look out for ones that already have a few people in aswell. Click Join, then a pop up will appear, click join on this. Although sometimes this llatter option is not available, if you click info there should be an I.P. Boot-up FS9 and go to multiplayer and type the I.P in and click join. When joined set your weather to updated every 15 mins, as most people use this, and choose your aircraft. However sometimes you don't start where everyone else starts, so check what airport you are supposed to be at by either looking in the info part that i mentioned earlier or press enter whilst in FS and type in ?help there are various commands that can be input to find information out. The other way is to just type your question in and someone should be able to answer it for you. You can talk to people using that feature.