Trying to find setup for 4 inch speakers, subwoofer and a new radio, please help!!

I recently got a 1998 Chevy Geo Tracker (2 door convertible, manual) as my very first car.

It has two 4 inch dashboard speakers and two 4 inch rear speakers. What sets of speakers should I get? Also, I have a 10 inch subwoofer, do I need an amp as well? If so, could someone please show me which should I get?

I was also looking to replace the radio as the one that came with it is just very bad quality. I was looking to get a touch screen radio, the hole that the radio can fit into has dimensions of 7 inches wide, 4 inches tall and 8 inch diagonal.

Also, are there any good guides to install all this stuff?

Thanks for any and all help on this! I have no experience doing anything with replacing/installing car speakers so any help is great!