you will be fine adding a stereo. If you dont have the know how and some tools, take it to a shop for installation. Speakers you should do yourself however. Alpines are great, but if you want an eclipse its not a bad choice by any means.
You can find clears at the dealer for about $35 per, shitty ones at prostreetlighting for about $25 for both, and just about any online bimmer store.
<span style='color:gray'><span style='font-family:Courier'>1995 e36 3 Series RIP
1999 e46 3 Series BURN IN HELL
2000 MR-S Roadster= Current</span></span>