The Goodman Games setting is a good choice. There's plenty of adventures for it, and the set has enough stuff to get you started.
I'd also recommend -
Player's Handbook 2: This is a good source of new classes and feats, plus advice for players and rules for organizations.
Dragon Compendium: This has new toys for players (races, classes, feats, prestige classes), but it also has a lot of useful articles for DMs. The 7-Sentence NPC, Instant Adventures, Not Another Magic Sword, and The Answer is.... The Riddle! are all really useful for DMs.
Dungeon Mastering for Dummies: Some parts of this might be too basic for you, but a LOT of the info is useful for DMs of all experience levels.
Miniatures: If you want to add some D&D miniatures to your collection, I recommend the War Drums set as a good place to start. It's a starter set, and it focuses on basic monsters (orcs, goblins, skeletons, zombies) to let you build a nice variety with only a few packs. The starter set also comes with two double sided poster maps that you can use as adventure sites. A starter and two boosters goes for about $50 and gives you 32 miniatures. Plus, you can play the D&D miniatures game with it.
Spell Compendium: This is a really handy reference with hundreds of spells collected into one, easy to reference place.
I'd also recommend -
Player's Handbook 2: This is a good source of new classes and feats, plus advice for players and rules for organizations.
Dragon Compendium: This has new toys for players (races, classes, feats, prestige classes), but it also has a lot of useful articles for DMs. The 7-Sentence NPC, Instant Adventures, Not Another Magic Sword, and The Answer is.... The Riddle! are all really useful for DMs.
Dungeon Mastering for Dummies: Some parts of this might be too basic for you, but a LOT of the info is useful for DMs of all experience levels.
Miniatures: If you want to add some D&D miniatures to your collection, I recommend the War Drums set as a good place to start. It's a starter set, and it focuses on basic monsters (orcs, goblins, skeletons, zombies) to let you build a nice variety with only a few packs. The starter set also comes with two double sided poster maps that you can use as adventure sites. A starter and two boosters goes for about $50 and gives you 32 miniatures. Plus, you can play the D&D miniatures game with it.
Spell Compendium: This is a really handy reference with hundreds of spells collected into one, easy to reference place.