Yep I hear you, we all start out lost in Linux.
Best I can tell you is browse around YouTube, there are plenty of How-To tutorials on basic linux use.
You can also have a graphic front-end–a GUI, like Windows–to do the file manipulations if you don’t want to use the arcane command-line tools. I force myself to use command-line because ultimately it’s faster and more accurate. But if you “startx”, you’ll get a basic GUI in Debian.
Sounds like you’re starting from ground zero, with a steep learning curve. The benefit is you’ve got an incentive–and if you learn it you’ve got a new professional skill :)