Hey kaiser_ryu,
For me a warm up generally consists of skipping with my speed rope, followed by some jumping jacks and arm swings. Just stuff to get my heart rate up and body warm. Normally i do not stretch before i workout but try to after the session.
On major thing to remember is not to neglect the warm up, if you do not warm up properly then you have a much bigger chance of injuring yourself.
Keep working hard mate,
Sean