What should the majority of your daily calories come from?

depends on the lifestyle you follow..

average it would be 20% protein , 50-60% carbs , 20-30% essential fat

i wouldn't suggest for someone that is not a strength athlete or a bodybuilding athlete to reach the level of 30% protein...also try to avoid carbs in the late afternoon and add essential fat to your meals..

best sources from each:

CARBS

starchy:brown rice, potatoes, sweetpotatoes, yams, whole wheat bread or pasta etc

fibrous:all kinds of plants as much as you can

simple:fruits and diary (2-3 pieces in a day)

PROTEIN

chicken breast, fish, turkey, egg whites,low fat diary,"as lean meat as it can be"

ESSENTIAL FAT

olive oil, flaxseed oil, oils from fish(ex. salmon), raw nuts, peanut butter

REMEMBER to drink as much water as you can, 2-3 litres a day , having in control also salt(little bit, just in case you over do it and flood your body with water....)