Replacing factory speakers?

[Crazzed]

I want to redo the whole sound system in my mustang. Problem is I'm not really sure what I need to know about replacing the factory speakers. Some of them are already blown and I wanted to replace them regardless.

Also, I'm trying to figure out what else I need and this is what I've got so far..

-250 watt rms amp (seems low to me idk..)

-JL Audio 10W3v3-4

W3v3 Series 10" 4-ohm subwoofer (would like 2 but thinking i only need 1).

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[trumpet 5,000+ posts]

Year and trim level of the Mustang? Basic or premium audio?