
We can't explain the universe, just describe it; and we don't know whether our theories are true, we just know they're not wrong. >Harald Lesch
I don't know what drivers I have,
Every device in and outside your computer needs a driver. Most of them already included on the Win98 CD, but common exceptions can be graphics cards, sound cards, printers,
USB Drives, special mice/keyboards, and network adapters. There could be more since I don't know what hardware you have.
Basically if you're unsure, get the driver. Better safe than sorry. With the exception of USB drives you should get the drivers from the manufacturer's site.
With USB drives it's a bit annoying. Although Win98 and ME are pretty much identical ME comes with a generic USB driver, while Win98 (even Second Edition) does not. So technically you'd have to install a driver for each and every different USB drive you plug into your computer. But many manufacturers didn't even bother to write one. So just get the generic USB driver I linked you to and you should be ok (in most cases).
and where would I store the files for them? just on the computer I'm using now?
When you format your computer everything (on that drive) is wiped. So keeping it on that very drive is unwise.

Burn a CD or put it on a USB drive.
If you don't know what it is, don't bother. Google can help you explain what it is, but I strongly recommend against doing it yourself because misuse can make your computer unbootable.
Get
DoubleDriver and just back them all up to a CD, or any other removeable media.
I can't recommend this procedure. It might be easier, but it
could cause more trouble than it saves. And when something goes wrong you might make your windows unbootable. This isn't a major problem if you know what you're doing, but judging from your questions I'd assume you wouldn't know what to do then, so better go the safe/clean route and download them all manually.
To explain this a bit: If I understand it right the program rips your current drivers from your current system and stores them wherever you tell it to.
This can cause a couple of problems:
- Driver is outdated. Newer drivers usually perform better and/or have more features. This can mean up to 20% more fps in games for graphics drivers.
- Driver is broken / gets broken during extraction.
- Driver is for the wrong OS. While ME and 98 are very similar and most drivers work for both, not all of them do.
Also it's usually a good idea to do things manually to familiarize yourself with your computer. You never know when your gained knowledge comes in handy.