A Ramp job usually involves:
Chocking the aircraft wheels when it stops on stand,
Connecting ground power to the aircraft,
Pulling (or driving) steps onto the aircraft,
Unloading the inbound bags and putting them onto the baggage reclaim belts,
Loading the outbound bags,
Removing the steps and ground power,
and after you've got some experience, doing a walkaround of the aircraft to look for any damage, driving the tugs which push the aircraft back and communicating with the flight crew via a headset during the pushback.
It will vary between companies and between airports, but that's the basic turnaround for the ramp team.