Oh, one small piece of advice before I take off for awhile. This will probably seem obvious, but I should stress one VERY important thing about hosting tournaments (especially online, but in general, too): be very firm on deadlines. There can be a tiny bit of wiggle room for emergencies, but too many tournaments fall apart because of three or four people holding things up by not posting regularly and doing their matches. If someone's not being active, give them an elimination (putting them in the losers' bracket if they haven't been previously eliminated), and do NOT go back on it. Just make sure they're given a warning via PM beforehand. If the don't answer or post to say what they're planning to do, it's on them.
The worst thing a tournament host can do is allow their tournament to go into limbo.