The USAS Campaign is a good one for someone completely new to WOFF I think and used to multiplayer, it's the nearest you get to an 'instant action' campaign, there are so many Jastas and other formations all over the place, you always meet up with something on your missions.
I've got a couple of campaigns on the go, my USAS one and my FE2b campaign flying in August 1916 currently.
Here's a picture of a recent victory I had in my Fee. My gunner did a fine job, turned an Eindecker into a Neindecker
Again though the devil is in the detail, and the details are great in WOFF.