If you're growing indoors, here's some of the things I use:
Fox Farm soil seems to be pretty popular around here, and it's what I've used during the few grows I've had with great results. You could use Fox Farms Ocean Forest soil or a mixture of Fox Farms Ocean Forest and Light warrior. Both worked out well for me. If you go with Fox Farms soil, you could pick up the Fox Farms 3 pack nutrients (Grow big, big bloom, and tiger bloom). You won't have to use the nutrients for about 4 weeks, and then you can start feeding them at 1/4 or 1/2 strength according to the chart provided. You will also need a PH tester and drops to adjust the PH of your water. The ideal range is 6.3-6.8. I would recommend getting a digital ph tester, although ph test strips would suffice. You can get a digital PH tester on Ebay for 30 bucks. Hanna seems to be a reputable brand name.
You're going to want pots if you choose to go that route. 1 gallon per foot of plant you want to grow is a good rule of thumb. A timer to switch to 12/12 lighting during flower, unless you're growing outdoors. I use a Intermatic digital heavy duty timer. It's only 20 bucks on Ebay and very easy to setup. You'll also need a grow light, fans, a thermometer, an illuminated microscope from radioshack or jewelers loupe to check trichomes for harvest, and maybe some mylar film. That's the basics I can think of off the top of my head. A good website to get most of this stuff from is htgsupply.com
If you're not growing indoors, you can pretty much ignore my entire post. You should check out the stickies and grow guides around here if you haven't already.