Dwight Howard of Baseball?

I am playing fantasy basketball for the first time this season. I am in love with fantasy sports now! My friends are going to be playing fantasy baseball and I need some advice please. I notice in fantasy basketball that big men who can score, rebound and block (ex. Dwight Howard, Chris Bosh, Al Jefferson) are extremely valuable. In terms of baseball what would you say are the most important categories are and the hardest to come by? I didn't do too well in basketball so I am hoping to dominate in baseball. I ume HR are a rear commodity? Do I go pitching first or hitting? Any advice would be great. Get as detailed as you want haha...