The learning curve can seem overwhelming when hit will as long line of links.
I would suggest that first you open the program to the Expert Guided workspace and work through the lessons there. You can always circle back to links later.
After you work through Expert Guided lessons successfully, then the links that would be at the top of my list would be
Adobe TV Learning Premiere Elements 12
Premiere Elements 12 Help PDF
Elements Organizer 12 Help PDF
Please do not hesitate to ask questions and ask for clarification here. We are prepared to give you customized Premiere Elements answers to your Premiere Elements questions.
And, remember, if history repeats itself, Adobe should be releasing new versions for Photoshop Elements and Premiere Elements at the end of September 2014.
Best wishes moving forward with your Premiere Elements projects.