Replacing speakers with monsoon.

I want to replace all my speakers or at least my front stage. I have the 6 speaker. 2 doors. 2 tweets. 2 6x9's monsoon system. I was wondering
1) How do you replace the front speakers. (I already know how to do the rears)
2) How can I hook them up to the monsoon system if it's even possible.
Thanks,
Itsbmw.

EDIT: Do I really need to upgrade my 6x9s? because I have my subs already and dont want to spend the money if I dont need them.