Depends on what game your running, on where you can find modules and campaigns, you didnt mention what system it is. Some people use premade ones, and some people imagine/create/design their own. Like myself, I haven't used any premade campaign since the late 90's. I start with the characters players made, setup the world for them, work from a simple idea of "x and y is happening around them in the world" and run it fleshing the story and world out as they play and make decisions on what to do, week to week.having it react and change from their actions. I've had one that was done that way that lasted 3 years of weekly play. That way is a LOT more flexible to be dynamic to what the players do or can do. but also a LOT more 'busy work' for GM. Premade ones are a LOT simpler for the GM as far as prep time, but are stuck pretty much to whatever the campaign has planned out. Not suggesting one over the other, each GM is different. If you actually wanting premade ones, let us know what system you run and someone can help you out.
