22 - Ruined skillet?

Last night I made breakfast for dinner: bacon, eggs and toast. I used a cast iron skillet for the first time and I had no idea what I was doing. As you can see from my picture, I have some learning to do. I scraped for at least 20 minutes trying to get the dried up egg gunk off of it and finally gave up. I don't know how to use these pans. I'll take any lessons I can. Anyone know what I should do next time?