Ok, so you have 4 tracks for the drums, i guess you have the kick, snare, hit hat and over heads with toms, it's the classic set up with 4 mics. Anyway, if you have the kick isolated you can trigger it very easily with a sample, there are tons in the web, the same goes for the snare, your sound will improve with this. The guitars should be doubled to open the sound. To the vocals use the Autotune and add some Eq on it. With that you'll get the tools to make a nice mix. Maybe not a pro, but it will be much better.
Cheers