You first need to determine how many other fixtures are on the circuit. This can be done by turning on all the lights and turning off the breaker for that one kitchen light. See what else turns off. You should also check all outlets in that area. Many times, folks will put lights on with receptacles, not really a good practice. You also are limited by the size of the wire, 15 amps if it is 14 gauge, 20 amp if it is 12 gauge. It is probably 14 gauge for lighting.
Starting off with a question like this, I would recommend you call an electrician and have it done safely and correctly.