You need some performance upgrades and a lot of money for tires. Make sure your flued levels are at a normal level and if your going to drift for a long period of time you will definitely need performance upgrades so your engine has less chances of overheating.
References :

There are performance driving schools to learn car control. Drifting is taking car control or out of control to the max. Many very good drifters crash there cars while out burning off a set of tires each night. I recommend learning on a skid pad wet track the method of sliding under steer and throttle over steer before you decide drifting is for you. You must have very quick seat of the paints reaction time to drift well. One out of ten drivers can catch a car sliding one way and make it slide the other way and control the powerslide. Not only power the drift car has to be set up for drifting suspension angles and shock settings. Making the car ride different for the street
References :
Nissan Master Tech

I’ve been drifting for 9 years, the last four for nismo north america. When i first got started all i did to my car – a 92 240sx – was a set of lowering springs and some used tires from a local junkyard or tire store. That’s how you should start. Once you get a feel of the cars natural tendicies during traction loss you can start adding. Start in a parking lot practicing with the e-brake (always press and hold the clutch in until you’ve pulled and released the e-brake). First try doing 180′s without killing the car. Once you’ve got that pretty much down try doing 90 degree turns. Again, once you feel comfy move on to doughnuts. This WILL require your traction control to be off as will the next exercise. Next its time to try some figure 8′s. These last two will begin to wear on your clutch, viscous lsd, suspension components, and tires. The thing to remember is that you’re going to break parts but this is when you upgrade to more duriable aftermarket parts. Eventually you’ll want to switch to a clutch-type lsd, either 1.5 or 2 way, as the viscous unit will begin to be a hinderance. This is basic stuff but it’s a start. Also, honestly i would look for a rwd clunker to start in as you are more apt to not worry about wrecking your $30k Z. It’s also a good learning platform to gauge commonly needed replacement parts so you can better prep your Z for once you’ve gained valuable seat time.

Now having said that, it is my duty as a racer to tell you to take it to the track and off the street as you endanger more than just your own life when on the street. Also drifting on anything other than a closed course is dangerous, irresponsable, and highly illegal.

That said just don’t get caught and make sure and bring a buddy or two along incase you run into trouble. For more techniques and set up advice search the net, key words: drifting techniques or setting up a drift car.

Good luck and good drifting.
References :
9 years of drifting (3 on the streets of Osaka, 3 on the streets here in the U.S., and 3 sponsored by NISMO as a demo driver for Formula Drift)

Team Tru Slyde since 1999