#1
i don't mean like G D C type stuff i mean can someone give me examples or something of chords or 3 note stuff that go well together when being played at the same time? i hope this makes sense haha
#3
If you play a Major chord and it's relative Minor at the same time it sounds good.
I guess you mean Harmony, 3rds, 5ths ect.
You should really try and learn more theory.
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#6
Basically, what you are asking is

"What notes sound good together?"

and

"What rhythms sound good?".

Seriously, seriously vague questions - try just living and breathing music theory and experiment madly for the next few years and find out.