six speakers and one amp how?

well it goes like this:

Pair of 6x9 rated 100 rms each

Pair of 6 1/2 component rated 120 rms each

Pair of 8 subwoofers rated 130 rms each.      All of them rated 4 ohms

One Amp:  4 channels 100 RMS per channel, bridgeable.

Need your advice in how to wire to obtain the get the best of this.. thanks a lot

If your amp can tri-mode you can wire all of your speakers to your amp and shouldn't have a problem.  You have to purchase some capacitors and coils and make a passive crossover or you can just wire them in-line on the speaker wire.  It all depends on what type of look you are looking for.  see the 12 volt link below.

https://www.the12volt.com/caraudio/cross.asp

Which ever set of speakers you are using up front I would use with the amp (I hope its the 6 1/2 components). Then I would use the lowpass crossover on the rear channels and connect the two subs to each channel. Power the 6x9s off of the deck in back and it should sound good.

You mean to parallel-wire the right side, and same with the left side, to keep your music in stereo.  It's possible but a bad idea.  The amp will be powering the speakers at a 2 ohm load....okay for low freq subs but not for the mids and highs.  It won't kill the amp or the speakers but will result in less than ideal sound.  And, you wouldn't be able to fade the rears as all speakers will get the same volume.  So I'm also with customsuburb on his recommendation.  But I would link the subs in series, then bridge across two channels for the same output as would be with a sub on each channel.