There are no shortcuts. Load reference songs in SONAR, analyze their frequency content with something like
Voxengo SPAN, compare to your own tracks etc.
There isn't anything like "industry standard for recording bass/guitar/anything", there really isn't.
The most important thing in creating good mixes is giving every instrument enough room regarding frequencies.
Regarding panning, propably the only consensus is that bass (and preferably anything under about 200 Hz) and kick are always centered.
Say, if you record a piano part played with both hands, the lower part clashes most likely with bass guitar so much,
that you need to practically eliminate it. Guitars and vocals don't need anything under 100-150 Hz, so cut it out.
Cutting everything under 40 Hz in master bus may clear out useless rumble. Sidechaining may help to get extra separation for pumping kicks etc etc.
It's better to compress slightly in several stages (on track level, then on project level) instead of smashing all at a time. Often some volume automation is good before compression.
Gain staging matters, but I've never considered it a biggie in my workflow. When my track output levels are appropriate (not too hot to give room for moving up or down when necessary) so that everything works in master bus, I don't give one thought separately to gain staging.
I'm sure there are plenty of guides, videos and tutorials about compressing, EQ and such on the internet. I doubt it's usefull to start copy-pasting them here. If those FXs remain misty to you after watching the videos, it might take a lot of text to explain them here :o) The site
www.tweakheadz.com used to be very useful to me a few years back. There were very well written guides about most anything home recording related. This
http://downloads.izotope.com/guides/iZotope-Mixing-Guide-Principles-Tips-Techniques.pdf Izotopes mixing guide isn't bad either.
You just need to patiently play with compressors and EQs untill you can hear what they do to what kind of audio material. If you don't hear and see how they work, there's no way we can know what sounds good for the song you're working on. And there's always the question about your monitoring quality. Even with quite usable monitor speakers a really bad room can make mixing almost impossible. Then you need to compare the mix with headphones, speaker, car stereos and any equipment at your disposal. And of course, use reference tracks.
Books like Roey Izhakis "Mixing Audio" are really useful. It comes with an audio CD with sound examples.