Tips for my 1st campaign

Hey all, I'm prepping to run my first campaign and I could do with a bit of advice and tips. The plan is for the players to start in captivity in a kind of POW camp and they have to escape. I'm going to tell the players about a rumour of a Mage of some kind having being brought in to the camp, and it's hinted that they should make some kind of distraction in order to get the guards away and they should sneak in to the building where the Mage is being held. They release the Mage and together they start a rebellion by burning down the buildings that the guards use and kill all the guards. I haven't figured out the specifics yet but I could do with some advice on runnin this kind of scenario and tips from anyone whose done anything similar. Thanks!