Do you want to work it top-down or bottom-up? Do you want to work flat, then seam or work it in the round for minimal seaming? Raglan sleeves, set-in sleeves, drop shoulder? There are so many things to consider that giving a reccommendation is difficult. I suggest that you might want to look at raglan sleeve sweaters because in some ways they are simpler. Did you find anything close to what you want at Ravelry?
I should never overestimate my basic arithmetic skills.