1. In windows Explorer, open the folder where you music is stored. Click on the first part. If the only music in there is that that you want on the EHD, hold down shift and click on the last part, otherwise hold down Ctrl and click on each part in turn - this will select and highlight all the files that you want to copy. Right-click on any one of them and copy.
Browse to you EHD which will have its own drive letter. Right-click in a clear area and choose paste.
2. To play the files back open either My Computer or Windows Explorer, browse to the place where you copied them, double-click to play back.
3. Not sure what you mean by everything, but the above technique can be used for copying or moving multiple files and folders.
4 and 5 - No idea what Scrapbook is...