there's no easy way here man.. practice makes perfect and it's all about eq and making sure you put the right frequencies in the right places AND fill up the frequency spectrum. then you need to learn tricks such as reverb to help 'fill out' the track even more ie push sounds back and forward in the mix, compression to make parts of sounds seen louder (ie phaten certain sounds up) and then there's stereo which makes mixes sound exciting and really well produced (i'd forget about stereo if i were you though until you've learnt the basics).