What do I do about the leaking coolant
What to do
Can you work on your own car? First thing is to find where it is leaking. Then replace the part, (water pump, hose or gasket). Refill with new coolant. If not, then find a local mechanic who can help.
I think that since you have to ask what to do you should have a reputable mechanic take care of the leak. Driving with the leak may create a bigger, more costly problem so take care of it as soon as possible.