First time audio setup, need help please!

I got a free kenwood w3003 with a box from my grandfather, he said it isn't working but doesn't know why, now a suspect is the amp being dead, but i don't really know neither do I have tools to check that. Would getting an Alpine 3527S for 35€, be a bad deal and/or unlikely to fix my issue?

I'm also wondering about wiring, what exactly would i need to buy, is a generic sub wiring kit good enough? My car is a 1999 seat cordoba.

On top of that I'm looking at a set of

Focal Access 165 A1 mids, tweeters and crossovers Paired woth Focal Integration IS 165 mids and tweeters.

Would such an amp suffice and what would i need?

I have done some research but am completely lost in this landscape, and would really be thankful for some help.