I have an idea for a campaign that I have wanted to run for a while. I have the world, history, main plot and most of the major NPCs figured out. But I'm kind of struggling with... now what?
I found the mass of free maps that WotC released and I have flagged a few of them to use, and I know where I can find suggestions in the DMG and MM as to possible encounters for different environments and I even have a few unique monsters/races written out.
But how do I go about writing the campaign? How do you guys design it? I mean, is it just brainstorm after brainstorm? Do you brainstorm chronologically, by the order the PCs will progress through the adventure, or geographically, visually placing dungeons and events on a map? Are there any materials that lend themselves to GM brainstorming?
Also, if you have any suggestions on how best to make the a campaign moving smoothly, please let me know, My group is rather large (6 players) and tends to lean towards the bloodthirsty.
Edit: Thanks to all of you who offered your advice, it really helped. With your suggestions in mind, I have come up with another question.
I had originally planned on introducing the PCs to this new world that my campaign takes place in, because it would be easier, I thought, to introduce them to the new aspects of the world little by little. There are some really bizzare aspects, especially in the matter of the deity system. And because that's kind of how the plot evolved in my mind, with the PCs as planehopping adventurers. But now I'm thinking that it might be better for me to give them the background of the world and let them be natives, give them a chance to get familiar with the world as a native rather than a foreigner. It would be easier for me to start small that way, as you've suggested. What do you guys think?