It depends on the current state of your ear's health when the ear drum bursts and chance. If you have an infection such as severe acute otitis media, you'll have a clear gucky substance coming out of your ear and usually some pain. Sometimes the substance can be a different colour due to whatever accumulated in your ear or from an infection (i.e. entered your ear via Eustachian tube). In some people though, there will be next to no pain, although there will be a noticeable difference in hearing. Unfortunately, many people will continue to feel pain or sensitivity even after their ear drums have healed completely.

You can also try products such as these. I have never used them but there is plenty of anecdotal evidence suggesting they're useful all over the Internet. I don't know if they're safe if you have a ruptured ear drum (not saying you do but just to play it on the safe side).