You have three options...
1. your car
2. the resort bus to Epcot
3. take the boat from WL to CR, get on the monorail there, go to TTC (next stop), change over to the Epcot monorail line.
It's pretty much up to you. If you have the time to kill, I love riding the monorail, but it isn't going to be the fastest way for you from WL.