iMovie 10.0.6 for Yosemite help needed

Help!! I'm lost with the interface for iMovie 10.0.6. I have created iMovies with previous versions of iMovie (the most recent being iMovie 9). When I installed and then opened iMovie 10.0.6 on my MacBook Pro running Yosemite, it also imported every last movie and clip I'd ever used and placed them in Events and Projects with no rhyme nor reason (at least not apparent to me). Now I can't seem to create a new Event or Project without part of a previous project being a part of it. I'm lost - obviously - and no, I'm not computer illiterate just iMovie illiterate I guess!! I'd love a written tutorial on using iMovie 10.0.6 that starts with the very basics but have been unable to find one -- I do better with written directions that watching YouTube videos - I need that step by step. Any suggestions from anyone? either on a resource (I did find one book but looking through it I realized that even though the book was published in Dec. 2014, it was not using the Yosemite version of iMovie). - if not a resource, can someone please explain how I start out with a project from scratch? I have a big project I'd like to begin - digitizing all my vhs videos of my kids and eventually creating DVDs of them. Worst case scenario, I go back to iMovie 9 or even 6, LOL. Thanks in advance!