I'm glad there is a fitness section i actually know my stuff on this. 3 Days a week is fine for mass. Fist find out your daily calorie intake: then go 500 calories above daily calorie intake. Its not so much how much you lift you will never get big without a proper diet so if your actually dedicated and want this you have to eat enough not just workout. Also, try to get in 1g of protein per body weight. Marcos should be aound 40% protein/40% carbs/ 20% fats. keep in mind fats don't make u fat.
http://www.freedieting.com/tools/calorie_calculator.htm
Like Mephistopheles said do big compound lifts. Usually a 3 day split would be for example would be
Schedule
mon - push (chest,shoulders,tris)
wed - legs
fri - pull (back,bis)
"push" bench press, shoulder press, dips, triceps extensions
"Legs" squats,lunges, leg press, calf rise
"Pull" deadlifts, barbell row, bicep curl, pull ups
rep range should be from 8-10
rest from 1 - 3 mins usually 3 on the bigger lifts