yea,.. right on both, but...pending on what kind of sub it is you might want a bandpass box for it, if you have just one, check pawn shops or sale ads there not bad for a one sub box, depends on the size it is though, and what kind, bandpass jack with the sound, im gonna get one for my 2 jl 12's but i dont know if i want a 2 or 3 sub box because i have 3 but use only 2 (not enough of an amp)....
but you want/need a good deck with 3 pre amp outs, unless you plan on runnin it off of the deck rear speakers which can be done but at mos, dependin on the deck your gettin 35-50watts per one but you cant tie both rear decks into it becasue it jacks with the (cant remember word needs sleep.)--point is it'll blow your back channels out of the cd player if your lucky most cases it blows the entire thing to crap...
an amp is useful just dont get one bigger than the wattage handling of the sub, unless its multi-channel and you plan on gettin more later, then i'd wait on the box if i was... but multi-channels divide the big number on the box by the # of channels like a 800w 4ch can go
--ex..- 800w-1ch(bridged) , 400w 2ch or 200w out of all 4
amp wiring kits are useful and will give all you need to hook it up for the most part....I have a scoche kit in mine, its a multi amp kit thats good for 1300watts... with the main power cord thats a 2gauge through the firewall, some people run it under their car(i've seen it...hehe...its a bad idea..), through there door at the corner where it meets like the end of the hood, or through the firewall... i've heard of some incidents, not in taurus', of wires in the firewall meltin or causin fires, but i haven't had a problem yet and i'm not worried about...
-Onwards; the trim provides anice place to hide your wires...you can mount the amp under your back seat somewhere or in the trunk, in or on the sub box, or if your reducing weight, were the donut/spare should be....
well, thats a small reference, have fun and bump away.......