I just bought my first one last month. I'm on my second season with Celtic.
Last season I won the lague and the Scottish cup, I got through two qualifiers to get into the champions league this season, and they handed me Barcelona, Roma and Wender Bremen. I secured European football after christmas but I have to beat Barca in the nou camp to guarantee I get into the last 16 of the Champions league. If I lose and Wender Bremen beat Roma then I'll be in the last 32 of the Europa league.
It seems really difficult though, in the first season, I kept having to quit to stop dropping loads of points and getting knocked out of cups
I still don't know if that's a good thing. I could maybe get into the last 8 of the Europa league, but the last 16 of the champions league is where you want to be