Here's an all-age sermon on Isaiah 6.
Sermons on the passage tend to follow a three-point model - and mine's no different actually.
Look up - WHOAH!
Look in - WOE!
Look out - GO!
Usually the preacher works Christ into the middle point - His altar (the cross) is the source of our forgiveness.
But I think it's important that all three points centre on Christ. He is the LORD Almighty (John 12:41). He is the atonement. And He is the Holy Seed in the stump to whom Israel must look.