The power of your bike will determine how much throttle you need to apply. When you get it right the first time you will most likely scare the crap out of yourself and chop the throttle. The second method for getting the front wheel off the ground involves using the clutch. This technique requires a good feel for the clutch and the ability to do about four things at once. Start by getting the bike rolling about 15mph in first gear or about 20-25 in second gear.
Speed has a major effect on how the front wheel rises.
The faster the speed of the bike, the slower the front tire will come up. Now, in one quick and fluid motion, squeeze in the clutch, roll on the throttle, and fan out the clutch. You need to release the clutch quickly, but don't just drop it. As the clutch begins to engage again, the front wheel will start to rise. Another similar way to accomplish the same effect is to quickly fan the clutch in and out while accelerating hard.