Wow... lots of info to sort through here.

Here goes:
99 Contour 2.5L SE, I do not have Premium Sound printed on the speaker grills. I do however have the amp behind my glove box. Yesterday in between reading here I removed my driver side door panel, removed my factory radio and the amp.
I'm now at a point where I don't know what I want to do. Do I want to use wire harnesses, do I want drill new holes for speaker wire, do I want to run RCA's to the trunk for a future sub...etc.

Here's my issue, does the standard sound system have an amp? I do have the factory amp but it does not say "Premium Sound" on the grill. It's a bit conflicting when looking for parts. Any insight? Thanks!

Is there a walkthrough here for when not utilizing a wire harness?