the BEST resourse is youtube!!! Dude what are you using? Reason?
I can tell you how to sidechain in reason very easily.... *main sound* into a mclass compressor into your mixer. Then create a redrum and put a kick sample in channel 1 then click those little step sequencer things to make a 4/4 beat ( on 1, 5, 9, 13 )....
then take that kick sample ( channel 1 ) and plug it into the sidechain in on your mclass compressor. threshhold and ratio contol how much it wil compress!

Simple stuff! then play with attack and release!