We don't currently have any video tutorials, and will most likely not create any until we have released OMP 1.0 -- the interface is still being modified substantially as part of our testing process, so any videos we make now may be out of date even in a few days.
I have been tracking your questions here, and will be updating our OMP Userguide
to clarify some matters. I would suggest keeping track of all changes made to that page, so that you know exactly when more information is available. You can do this by logging into the wiki and clicking the "Watch" option for that page. (I have just registered an account for you on the wiki -- you should receive login information via email.) If you have any further questions, please let me know!