#1First is a thru hike permit. Click and get it.
#2Next is a California ampfire Permit. Click and get it.
#3 You will need a Canada Permit
Click the above links, print the permit, then hit your back button to come back. These are the basic permits required to complete a thru hike but,... if you also want to do Whitney along the way (and you so should!) then read this. Straight from the pcta.org website:
The U.S. Forest Service has implemented a $15 reservation fee to climb Mt. Whitney, exit and re-enter the Whitney Portal on the east side. Plan to exit and re-enter within 48 hours. Reservations for Mt. Whitney must be received at least 60 DAYS prior to the expected date of entry into the Mt. Whitney zone. Requests received less than 60 days in advance will be returned. If you would like to climb Mt. Whitney, include the $15 fee (per person) along with your permit request, making sure that you do so at least 60 days in advance.