BigSlick440

Okay guys i know this has been posted before, i want to make sure cause i'am getting ready to buy a few things, i'am getting a jl audio stealth box with the sub, the 250/1 mono sub jl audio amp, and i also want to replace the sail panel and door speakers with jl audio 6" without changing my head unit, what exactly do i need to do this, without using an amp to run the door and sail speakers i pretty much want to add sub and replace all the speakers, let me know a.s.a.p also if i'am doing anything wrong let me know, cause this stuff isn't cheap lol,