I'm assuming you have a load of audio tracks lined up in a DAW on your computer and you just can't get your mix to sound right?
I think a good tip is to start with the drums. Get the sounding great on their own, and have them so loud that they would clip if you didn't...... put a limiter on the kick and snare so that the very loudest peaks get "limited" down.
IF the drums sound great, start mixing in the bass. Keep listening to the drums, and as they start to sound less good, think about what frequencies in the bass are affecting the drums, and try to EQ to compensate. If you have multiple layers of bass - why? Are they doubling a single part? For what reason? It may be necessary to cross them over using EQ, you may have to inverse the phase of one of them etc.
Then add in the guitar and vocals. A good tip above is "use fairly heavy equalisation". You may end up with EQ settings that look rediculous, but SOUND good.
If you get a rough mix done, upload it here and we can tell you what to do to it.