Sidechaining kicks is one thing but I'd suggest creating a clicky sidechain track for both kicks and snares since the latter forms the the backbeat and largely holds evertything together. Aswell as the usual highpass filters a hf lowpass on some of the percussive elements can stop the hi-end sounding too busy.
Processing bass is a matter of opinion, assuming you've got some sort of combined bass/sub patch or you've just bussed things together. I would suggest a two band multi split around 100-120 (this is where many club systems crossover) and processing the sub at first independently, I swear by VOS ThrillseekerLA as a bass maximizer but Voxengo LF-MaxPunch is also good. Uless you are expecting to play on Valve or other sub-orientated systems you can probably roll off 35Hz and below with a 2-pole filter. For the upper-bass, which may also serve as the lead, all manner of plugins will be of use. Some light chorus, a little delay, EQ, compression and most importantly some saturation/distortion. You may not need all of these and may find the order wrong but these are the basics. Additionally some kind of stereo spread on the upper-mid frequencies can really bring it to life, be careful to keep it mono or narrow below 300-500.
Other instruments such as pads can benefit from having a nice full frequency range some gentle saturation can add allsorts of extra harmonics, especially in chord patterns., finally an appropriate highpass will be unnoticable in the mix but clear space for the all-important bottom end.
As for other sounds, well it depends on the song, a little degradation can imbue an old-skool flavour. Some fuzzy saturation can add a barely imperceptible dirt to the mix.
While there's nothing wrong with using reverb and delay inserts depending on the sound, these work better on the return tracks by helping parts fit into one distinct place.
With all bass on one buss you can better maintain a consistent level with compressions and some EQ.
Pads, synths and effects can be bussed together, be aware that the long tones of pads may lead to slow but clear amplitude changes in melodies.
Compressing drums with multiple subtle compressors has become increasingly popular recently, while it can help smooth the mix and accentuate the percussive elements, it also offers the oppurtunity to use several different processors each with their own benefits (the extreme pleasant colouring of DC82 and the uber-clean transient oreserving Ktelnikov for example.) If your beats still ain't big enough, i suggest a limiter on the kick (MLimiter fits the job), while a well layered snare/clap will benefit from some harder compression.
I could probably go on but I think I've covered a fair bit here.