It's just called D&D (again) now. I've got version 3.5 books (Players Handbook, Dungeon Master Guide and Monsterous Manual I) but versions 3.0 are almost the same.
You don't need the minatures - it's just another Wizards of the Coast money grabbing scheme.
I usually find that for 90% of the time, no models are required. However, when players get in to a fight, it's usually handy to have some gridded paper and some models just so you don't get in to the old...
"I stab him in the back!"
"But you're nowhere near his back."
"Yes I am, I said I moved 4ft north!"
"But he's to the west of you..."
And so on. It saves a lot of time, but what you use as your grid, and what you use as your player tokens is entirely up to you. If you play a completely political (non-combat) game, then you wouldn't need any models at all.
Lastly, good luck with D&D - it's great. I only wish I had a gaming group right now :/