It's going to be quite the laundry list. I didn't know exactly how to go about starting it (as I have yet to find a sponsor), but this helped a lot:
http://www.12step.org/docs/Step4_Inventory.pdf
I hope I'm not breaking any rules in sharing. I found it helpful and hope it can help others as well. I actually look forward to picking my brain about every little event or person I've ever resented and releasing that negativity.