A Starter Race Bike: If you really want to learn how to go fast and have fun doing it, start out with a small bike that handles well. You won't have so much horsepower that you can easily scare yourself and you'll be forced to learn how to carry your speed into and from corner to corner. You'll also want to modify it as little as possible; keep the starter motor, battery, and a near-to-oem motor. This will keep it as reliable as possible and you'll spend less time wrenching and more time riding. Some good bikes: SV650, Honda Hawk, EX-500, FZR 400
A Trailer: The minimum is a single-rail trailer that you can slap your bike on and get down the road. If you can afford it I highly recommend some sort of enclosed trailer. You can keep all of your gear in it and it makes getting around that much easier.
A Truck/SUV: You'll need something that can tow your bike and your gear. Again, the more reliable the better.
Safety Gear: FooBargle, gloves, boots, and leathers are a must. Not only do the sanctioning bodies require it, but as these dudes can tell you, riding can hurt if you aren't careful. I recommend top of the line stuff. Your own skin is worth a lot more than a couple thousand $$ in safety gear.
Tools: You'll need to bring along enough tools to change tires, bleed brakes, replace broken parts, change brake pads, and whatever else you do to your bike while riding. And don't forget an extra helping of safety wire, duct tape, and zip ties :).
$$$ and lots of it: Last but not least you need money, and I mean MONEY with a capital M. You'll spend money on your equipment, travel, entry fees, tires, and food, just to name a few. Roadracing is an expensive sport and requires a considerable amount of disposable income.
