Congratulations on your new Empeg!

Since you've already installed a minidisc player and some speakers, you've got a little bit of experience with car installs already. But if those installations didn't involve an amplifier, then there's a whole other level of difficulty involved. You have to find a suitable location for the amp, then be willing to dismantle parts of your car's interior to run the wires to it.

If you're comfortable with doing that yourself, then definitely call Crutchfield and get an amp and speakers from them. Their phone reps are very knowledgeable and will make sure to send you all the stuff you need to install an amplifier.

(Um, now that I re-read your post, I'm not sure if you're in the US or not, so Crutchfield may or may not be an option).

If you're not comfortable with installing your own amp, then it's time to go to a stereo shop that can sell you the amp as well as install it for you.

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Tony Fabris