Spend 95% of your time learning how to balance the relative volume of sounds with just the faders. Honestly, the things that make amateur mixes sound bad is mostly in simple balancing. It's amazing how much horrible EQ, reverb, delay, compression, etc. you can get away with if you put the faders in the right spots. Conversely, if you don't put the faders in the right spots, no amazing EQ, compression, reverb or delay settings will EVER make your mix sound decent. Balancing with the faders is the least exciting thing, but it is THE most important. Not by a little, but by a LOT.
nearly 20 years full-time in this business. Three #1 records. A few dozen with commercial radio play. Trust me on this. And it is STILL the thing that I put the VAST majority of my effort into to this day.