Due to the extended length of each AI War campaign (10-12 hours at best), and the need for high levels of cooperation, matching strangers with one another seems like a recipe for a lot of incomplete games. AI War is meant to be enjoyed with friends; if you're wanting to get together a larger game, post in this forum.
All the participants will need to have compatible schedules in order to complete a campaign together, so make sure you post when you are available and when you expect your group to meet, if it meets on a scheduled basis.
This isn't like a quick pickup game that would just last 15-60 minutes, so you need to make sure that players aren't going to drop out of the campaign in the middle. If a player drops out of a campaign, you won't be able to continue -- however, you can have as many saved campaigns in progress as you want, so if some members of your group have lesser availability, you can complete a campaign with them at a slower pace, while at the same time working at a faster pace on a campaign with your group's regulars.