Not sure how smart it really is to do it the first few days. I would rather do it two-three days after release, because it may be launch day(s) problems. Only time will show how good of a idea it is. Even tho I know Warmane does a great job on their releases, there are still a lot to do.
Since launch is gonna happen on a Saturday, most people won't work on the first 2 days of the server anyway, and you can make it to 70 in 3-4 days if you really go at it. Also, OP forgot to mention which faction he's gonna roll so people won't know if they should even consider teaming up with him. In any case, I personally prefer doing most of the leveling alone, simply because a lot of the collecting-type quests don't have nearly enough quest mobs/items to go around for multiple people, so you can end up having to waste time waiting for your party members to finish, not to mention you have to share resources if you have the same gathering profession(s), Also you can't just freely travel wherever you need to (at least not without having to ask them to wait for you), worse yet if they want to travel somewhere, you will have to wait for them. Maybe on a 1-2x XP rate server it would still make sense to team up, but I'm sure on an 5x server it'd be more of an encumbrance...