bcbc,
You'll probably get lots of different answers to your questions, as MJ allows much flexibility. But this is how I manage importing and moving files. In Options, General, Importing and Tagging, I have automatic import turned off. That way I can play my files from a temp folder and not be concerned about the files importing into MJ at that point. I then use Windows Explorer to select those files I wish to keep and import them to MJ. I don't change directories prior to importing, because I think it's quicker and easier to do that in MJ once they are imported. I then do all of my tag editing from within MJ. I personally don't care what properties are displayed by Explorer, as I don't return to it again for library management purposes. After doing all of my tag editing and saving the file, I right click on the name, select Move, then pick the directory of my choosing. What's great about doing the move from within MJ, is that your library is updated and the file moved at the same time. I usually keep the file location field visible so that I can easily double check that I've moved the file correctly. Hoped this has helped a little.
Shelly