Here's a quick campaign for all you monster haters! After being absent for a long while, I'm back on the heavy warhorse's saddle.
Rules System Used: D&D 3.5 or D&D 4th Ed.
Books and Materials Needed: Core Rule Books (either 3.5 or 4th) (book), dice set (d4, d6, d8, d10, d12, d20), pencil, paper, a dungeon master’s screen
Suggested Extras: Complete Warrior (if playing 3.5) (book), miniatures
Location: Fantasy Europe
Number of Players Suggested: 3 - 5 (This campaign works best in an average sized group.)
The idea is that all of the PCs are a team of freelance monster hunters. The adventures they go on are all to hunt/exterminate/capture a specific monster or monsters. This campaign works best with heavy magic and being generous with magic items. Any races would work for this as well. It is important though that the players make sure that they have a balanced group ready to take on all situations and threats. I am currently running this with D&D 3.5, and in our party we have a human fighter, a human ranger (focusing on ranged), a human paladin, and a grey elven wizard.
As an idea for a first adventure you could have your monster hunting party approached by a wizard that lives near the town that the party is starting in. The wizard needs white dragon scales to complete a ritual / magic item he is working on. He's willing to pay the PCs 1000gp each if they return with a white dragon. The wizard should know of the location of a baby white dragon and give the PCs a map depicting the location. Oh, and of course, the PCs are welcome to keep whatever loot they find during their travels.
The route should take the PCs through a forest where they can encounter all sorts of things, such as goblins, wolves, etc. Arriving at a castle where the dragon is said to be kept in the dungeon, the PCs find that the lord is not as friendly as they thought he would be and have to run for their lives; barricading themselves in the dungeon. Fighting their way through the dungeon the PCs can encounter all sorts of baddies like: orcs, werewolves, undead, elementals, whatever. They finally find the white dragon... but he's not a baby. He's a young adult! The PCs have to fight the white dragon to leave via the white dragon's hidden exit.
That was my opening adventure for this campaign in a nutshell. It was played over many sessions and took the party from level 1 all the way to level 6.