I am currently 32 games into the 1st season with a Liverpool team using LFC Marshall's update. Like the guys have said above i would play Carroll target man and Suarez advanced forward or complete forward. i would also reccommend having a deep lying playmaker (i bought Charlie Adam).
I have found both Suarez & Carroll to have really poor consistent form throughout the season and i have had to depend alot on my other signings (Lukaku & Muniain).