i always do campaign first to get use to the controls (even though i played waw) and get use to the weapons (only played mw1 1time lol) then its what my friends are playing the online a lot and what ever else is fun. best game plan in my opinion
only people with no job or no school/college/uni will make it into the 1000's so all u kids in school forget about it and play for fun!
I'll b on those leaders though haha