Don't worry about the questions, I'm happy to answer them
I tend to use normal printer paper. Getting a light weight of paper makes it easier to see through the sheets. If I'm using this I have to punch some holes into it, and the requires a special kind of hole punch thta you only really get access to in animation studios.
The actual method of keeping the paper aligned is by using something called a peg bar which fits into these holes and holds the papers in place.
The punch itself is a few hundred dollars, but the pegbar costs about $5-10. You can get pre-punched animation paper with rules out the cost of the punch, it's it's designde for use in animation so you can see through more sheets.
As for the actual drawing; you place the paper on a lightbox - which illuminates the sheets from the back, allowing you to see through them. It's not
absolutely necessary to have one, much like it's not to have the paper hole punched etc, but it certainly makes working much easier and smoother.
There are other options of you can't afford the equipment or don't have space for it. Programs like Flash, Toon Boom and Easytoon (free GIF animation program) let you do it all digitally. It's much easier to work with these if you have a Wacom tablet as you'll be able to draw into the program with a pen (stylus) rather than a mouse, but either one is workable.
I'd actually recommend looking up some animation books on Amazon and such. The best one that comes to mind is
The Animator's Survival Kit by Richard Williams (who worked on Who Framed Roger Rabbit). That'll teach you just about everything you need to know about ainmation, and then some.