If you're using synth drums, the short answer is that there's nothing you can do to them to make them sound like acoustic drums. Short of actually buying yourself a drum kit, or finding a drummer, samples are your best bet. If you've got a computer - and I'm guessing that you do, seeing as you're on this forum and all - I'd suggest getting hold of something like Fruity Loops, Reason or Acid, all of which you can use to make loops or even full tracks using one-shot drum samples.
On top of that, there's a UK music tech magazine called Computer Music which gives away a cover-mounted CD every month that contains stripped-down but fully functional versions of sequencing and loop-making software. I believe the magazine's available internationally if you're not from the UK.