For wiring diagrams, go to 'Crutchfield.com'. They're free! It's also a great site to read reviews of any stereo equipment that you may be considering from Craigslist, or ebay.
If you're are comfortable buying from pawn shops, they can be a good source for stereo equipment, too. Although many won't get involved with this, anymore.
You'll be best off with one 4 channel amp for your speakers, and a seperate amp for the sub. This will make dialing-in the cross-overs much easier.
In my rcsb, I have 1 10" dual voice coil sub, wired down to 2 ohms, 2 6" mid-subs, & 2 6.5" components in the doors & the 1.5" tweeters in the covers for the outside mirror access. 600 watts to the sub, 500 divided among the other speakers. Alpine H/U. 12 disc CD/MP3 stacker. (Soon to be replaced by a Sat. radio reciever) All bought through Craigslist or ebay, including the 4ga wiring kit. Into it for under $750.00. If I bought all this new, it would be way over $2500.00.
I can irritate the neighbours a block away, but why? I like my system so I don't advertise it by cranking it up around home. Call me paranoid, but, you just never know who's lurking. Makes for better relations with neighbours, too. Most of mine don't even know what the sound system is capable of. It does get louder as the road & wind noise increases. Love it on the frequent long road trips.
(SONY for the house, not the truck. But that's just my biased opinion)