One of Might and Magic III's strong points is its non-linearity: You can do just about anything at any time. Sometimes before you can go into a certain dungeon you'll need to find a key, but that's about the only thing that limits your options. Since the game is so non-linear, a step-by-step walkthrough of the game is pretty much impossible. Instead, I'll be providing you with walkthroughs for each area seperately, containing all the info on what you must, or can, do there. But first of all:
When you've just started a game of Might and Magic III and you have no idea what to do, where to go, or maybe even how to play the game, read this section first.
Now a list of walkthroughs for every area will follow. For all of these, bear in mind that you may be able to clear some areas at a relatively low level, while others are inhabited by such powerful enemies only the most experienced adventurers stand a chance. Since it mostly depends on your party's composition which areas are easy and which are hard, pretty much the only way you can find out is by checking the area for yourself, making sure to save first, of course.
If you want a complete walkthrough of the game from beginning to end, here's what you do: Start at the Fountain Head walkthrough, since that's the game's starting point. All area walkthroughs have links to the areas which you can reach from your previous location, so when all the walkthroughs are finished, you should be able to "travel" through the entire world of Might and Magic III by using these links.
Outside Area Walkthroughs
The monsters in most outside areas will re-appear after you defeat them as long as their lair exists. I'll mark the monster lairs on the maps. Destroying them should be your first priority.
I'll add to the list of walkthroughs in the order in which I choose to go through the game. Since there's so many options open to me, I can't predict when certain walkthroughs will be up. Keep an eye on the main page for updates.