Almost no one prints manuals anymore, paper is so pase in the 21st century. All Apple products, like Canon, Nikon, HP, etc., have their manuals on-line as pdfs. Simply put it on your iPad for reference. You may update it when new OS versions replace the old. Try that with a printed manual. Oh, by the way, you may print it as well
iTunes is your method for communicating with the iPad, same as with an iPhone or iPad. Online manual for that as well.
Sorry it took your Chappy a week to figure it out. Most spend 10-15 minutes to do that.
If you cannot remember where you store your files you may wish to make notes. No, the iPad will not deal with your old PC directories for photo filing. It is not a PC.
Lots of free software to convert your videos to iPad friendly files. Google it.
You may wish to read up on this device and practice with it a bit. Please do remember that this is not a computer and do not expect to treat it like one.