my audio problems

[M8XY G]

ok i know a little but not too much

i have sony xplod 200w 6x9,

do i need front door speakers aswell?
do i need rear aswell as 6x9s?
a recommended sub, amp and door speakers?

looking to spend about 100-250 i guess not too sure?

 

[MT AUDIO]

-front instead of rears not 6x9s
-whats your budget
2nd hand or brand new

 

[M8XY G]

about £100-£250 is that enough or not?