Need audio help with my 2009 corolla s

Need audio help with my 2009 corolla s

Well this may be completely stupid, but here goes nothing.

I recently got a 2009 Corolla S 1.8 L

I would like swap out my audio system possibly the back 2 speakers, an amp possibly , the front 2 bases and maybe the tweeters most likely.

also I was considering removing the head unit and putting in a touch screen but not sure of what is even possible with the car.

Does anyone have any ideas of what i could possibly do? or options?

any help would be greatly appreciated.