2 LPChip
Nice point, about the equipment. (Maybe a subject for a topic : 'What's everybody's hardware environment ?')
by the way, is it so that i must normalize all samples?
Just figured something out for the beat. normalize the sample and put the default volume on 40 or so..mwHAaa
So you answered your own question.
I suppose you meant 'tweeters'

As LPChip stated, there are relatively cheap onboard cards with enough quality, so this has second priority.
The first one is to be able to monitor what you are composing, as good as possible via a speakerset or headphone.
Since you are composing a stereo-file basically, with two channels, it is important that it is also reproduced that way.
This soundkit you describe is indeed made for a game computer, but not very good for composing.
3 speakers, and I suppose the bass box in the center. This just gives the wrong impression of what you are doing.
Remember my comment earlier : "because almost all instruments are situated in the centre"
I suggest to replace this set by a simple stereo-set with just 2 speakers.
I think that a composer should be aware of the fact, that he has no control whatsoever how the track will be
listened to by the audience. Everybody has different soundsets, speakers, tone-settings, preferences of flavours.
This includes the composer listening to his own result. It's a different role than being a maker.
Every composer has it's own personal settings, when he listens to music. A punchy sound, loudness, clear, etc.
Now it's an iron rule in recording studios to have the monitor equipment's tone-setting as 'flat' as possible.
And flat meaning : all frequencies equally responding as much as possible.
Why ? Because otherwise you would fool yourself considering the final recorded material to distribute.
So :
While making, keep it flat when listening to the progress.
When listening to the final result, turn on your own punch-knob.