theres diffrent ways of arranging speakers cant remember the proper names of them but I'll explain... You can link each one to the amp or you can link them in a line, each speaker should have a input and a output, to link them in a line you just link the first speaker to the amp then the second speaker to that.
But I would get a seperate amp for the subs if I was you dont wana risk burning your amp out.
So you could link a sub and speaker to right and a sub and speaker to left
it looks like youve only got two outputs and 4 speakers,so this isnt going to work
its going to be bait.
good mate of mine has a 10k rig which he's spent...probably near on £25k on...
as far as using any big(ish) rig
your going to need a crossover,
if you dont know what a xover is,basically
you have two(or more) cross over points (frequencies) which the unit will split to seperate signals,and seperate amps
subs and tops.
and as a general rule of thumb with standard 19" rack amps,one amp to every two speakers...
so to achieve anything close to a decent sound,
you HAVE to spend more money
and then you should invest in a decent crossover and amps before you invest in more speakers.