Here are four missions, two from each campaign, for the Spitfire IX and P-51. All missions and briefing materials are pulled directly from period records. The pdf briefings are in WWII RAF format and contain info on the route, tactics, intel, and state of the ground battle.
You can also just jump in and come up with your own tasks. These were designed to put you in total charge of the squadron in a more or less open world. The real air plan will play out around you for about 90 minutes.