All of the ski areas are virtually right off the interstate highway, and there are signs everywhere. Once you get there you can pick up a Summit County Map for free. The place is designed for year-around tourist usage. Don't worry, you shouldn't have any trouble.
Copper is on I-70 at exit 196 or something. To get to Breck you would take the Frisco exit, which is also Hwy. 9, and that would take you to Breck, about 9 miles I think. For Keystone and A-Basin, take the Silverthorne/Dillon exit, which is Hwy 6. You can jump back and forth between the Keystone area and Breck area by using Swan Mtn road; you won't have to keep going to I-70 all the time. Everything is within 20 minutes max of each other.
Keystone/A-Basin is the 1st exit after the tunnel (Silverthorne/Dillon)----just go left at the bottom of the exit ramp and stay on the road, till you see Keystone. The Basin is just further up the same road.
Vail/Beaver Creek (not in summit county) is past Copper on 1-70.
You got it all now......(but let us know if you find Ski Cooper !)