It's pretty straight forward. I think you said you have some friends on the island already? Poke around for a couple of days and you'll figure out where you want to be. I moved there without ever being to Belize and came away unscathed. If you're 20 and looking for younger people, hit up Fidos in town. Mostly a tourist group with a few of the younger ex-pat islanders. Talk to the bartenders (Mike, Glen etc) and they'll get you started. I am more of a Crazy Canucks/Squirrel's Nest (more South) guy but I have some mileage in town.