hey I am new here and to putting aftermarket speakers and such into cars

my stock speakers in my car went out so I decided to spend some money to get some nice ones.

So I apologize if some of these questions are stupid lol

I want to buy a new in dash radio/ reciever and replace all of the speakers in my car so 4 new ones

So first off if I am not buying any subs do I need an amplifier?
I dont think I would but i want to be sure

Does it really matter if speakers match the reciever as far as brand wise


also if you guys have any suggestions as far as what to get that would be appreciated

thanks