Hi there and welcome to the forum!
Congrats for starting the AB process, there are lots of tips on achieving a WD in the 'FAQ: How do I get a wet dream?' in the general discussion area.
From what I've found so far, the consensus is that the best way to get a WD is no 1: don't masturbate, 2: don't touch or stimulate yourself in any way (apart from the necessary such as peeing and cleaning) and 3: don't watch porn or view anything which may get you aroused.
Lots of people on this site want to cut down on watching porn so they do this at the same time as AB. You may not want to do this, but not watching porn is advisable as it may increase the chance of you having a WD and stops you from being tempted to MB.
Apart from these things when AB, the best thing to do is to stay busy. It's a mind over matter thing and your willpower will determine how long you can AB for. But you also have your age on your side, as younger guys tend to have WD's more regularly when not MB, compared to older guys.
It may take a month or less than a week for you to achieve a WD as everyone is different but it is definitely worth the effort. I'm older than you (22) and I had never had a WD before joining this forum and I managed to have one quite quickly a few months ago (I'm now working towards my second). Log your progress and experience and hopefully you will be able to have a WD soon!
(The hardest part tends to be the first few days and then you start to enjoy the 'buzz' from AB so try your best to resist from MB. But don't feel bad if you can't go without MB for a long time to start with, it's all a learning experience and members on this site are very supportive if you're struggling)
Good Luck and keep us updated!