I've gotten so many things pierced, it's not even funny, so I'd be willing to help you out in this area.
Since the lip is a fleshy part to pierce, you should def. keep the original ring or stud in for about a month. Take a q-tip and use liquid antibacterial non-scented soap (I prefer Dial) and run it around the base of the piercing, inside and out. Do that about three times a day, after eating, as well as swishing with listerine or warm sea salt water. keep rotating the ring, and try not to touch it too much. Ice the piercing if it becomes swollen, and enjoy!