This is a two part question. Is it easy to figure out where it is leaking out and how do you get the stain off of the driveway?
Sometimes yes, sometimes no. Fix the leak before worrying about the stain. The stain won’t leave you stranded. The coolant leak could.
If you can’t see where it is coming out, a pressure test of the cooling sytem will soon reveal it. A knowledgeable mechanic can help you Cooling system problems are not that hard to solve.