You’re doing what I’m doing. Again, if you don’t buy DRM music, no need for MTP mode. And by chosing MSC mode on your player, you know that when you connect to any computer, you should be able to connect and you’ll always be seeing all the files on the player.
(Note that there likely were 4 or 5 songs on your player to begin with, a gift from Sansa. With my player, they only were visible on my computer when I connected to the computer in MTP mode. You can just leave them on your player; delete them using your player, to free up the space; or connect to a computer in MTP mode, move them to your computer, disconnect your player and set back to MSC mode, re-connect to your computer, and move the songs back to your player, and now they will be visible on your computer when you connect your Clip in MSC mode.)
The Clip takes 3-4 hours to charge fully from empty; your charge will depend on how charged the Clip was to begin with. Just leave it be for a few. And then enjoy some more! And it really is easy from here on out–just connect to your computer and drag and drop.