sugestions on a system

Hey guys

Just looking for some suggestions on pretty much everything. The does and the don'ts. I'm looking to get a system and don't know where to start. All I have is a Sony xplode head unit 52x4 watts flip down face. And looking to get some other upgrades. O.K. my rear deck is 6 1/2's and so are the ones on my front doors. Also would I need an amp to run those. I'm looking at these 6 1/2's Sony xplodes 200 watts, 3 ways 99 bucks a pair. And 1000 watt xplode amp that was I think about 300ish. And Xplode Subs. What kind would be a good size for my car and how much watts? And are those any good?. I'm really wanting to go xplodes all around what y'all think. Any help and suggestions would be greatly appreciated HOLLA BACK