there's no fixed rules mate, yes there are general frequency ranges you should normally use, as it depends on what samples you use.
I'm sure some of the guys will disagree but I tend to keep my drums all mono - but everyone has their own subtle differences in the way they produce
cymbals - u talking about when its used to start a breakdown (ie on its own)? or say when u use it layered with a kick at the end of a break for like a variation? - really depending on the context u use it in u can eq it accordingly
sometimes its best to just use ur ears to get everything to fit - u'll know if it sounds right if u compare it to say a pro tune
for bass normally u can cut a "hole" in ur sub for where the kick peaks (so u can hear it punch thru otherwise sometimes the bass can drown the kick) and possibly boost the same frequency of ur kick slightly - if that don't work you can try sidechaining (another topic lol)
if u want a bit of info on frequencies etc u can check:
http://alternatingfrequencies.com/2b4/index.php?topic=78.0
more of just a guide where particular sounds
tend to fit, defo not a be all and end all as it says in the thread
