First off, visit a sample Perseids Meteor gallery to get an idea of the types of photos you might want to capture.
Read about wideangle astrophotography technique.
Recommended ISO values to use are ISO 400 or 800.
Consider the use of the Canon Timer Remote Controller TC-80N3 for higher-end Canon DSLRs such as the 1Ds Mark III, 1D Mark IV and 7D.
Canon does not make a timer remote for the entry models such as the Canon 60D, Canon T2i / 550D / Kiss X4 and 500D / T1i / Kiss X3, so you’d need to consider purchasing third-party equivalents such as the Phottix Nikos. See Canon T2i / 550D / Kiss X4 Remote Shutter Release Trigger Options or Canon T1i / 500D Remote Shutter Release Trigger Options for more options.
The third-party remote timer switches can also be used on the higher end models. Just be sure to purchase the version with the correct connector for your camera.
Lastly, read about the differences between photographing asteroids vs meteors (shooting stars).
Related
Photography Tips – Main page.