Learn the basics of the guitar technique of tapping
Tapping is the process of using your stringing fingers to do fast hammer-on and pull-offs and using your picking hand to tap a fret further down the board in-between those hammer-ons and pull-offs. Once you have mastered hammer-ons and pull-offs tapping should not be difficult it implement into your guitar techniques. While it can be tricky to get a perfectly clean sound, the technique itself is not hard to get down. Once the technique is mastered you should start practicing cleaning it up.
I will give you an example of a simple tapping line. With your stringing hand put your index finger on fret 2 on string B. Now with your ring finger do a continuous hammer-on and pull-off on the 5th fret. You should be comfortable doing this already if you are trying to learn tapping. Now in-between these hammer ons and pull-offs with your index finger begin tapping the 9th fret on the same string.
You can start out slow to master the movement and to help you get a clean sound when the distortion is on. Once you get this down at a decent pace you will hear a very cool and unique sound. You have just played the beginning to the tapping part in Eddie Van Halens Eruption! Not as hard as it sounds is it?
There are many possibilities that can come from tapping. You can implement slides into it, tapping with more than 3 fingers, switching strings, and whatever you can think of you can do.