If you feel hungry all the time, you're probably better off eating smaller amounts more often.  If you do that, try not to eat any big meals, just a little thing every few hours.  Or you could eat three moderate meals and snack on fruits and veggies in between.  Maybe if you don't get hungry between meals, or aren't allowed to snack at school or work, then you could have bigger meals.

Eat whole grains and lowfat dairy, as those are said to be good for losing weight.  Try not to eat much red meat.  Eat baked or broiled rather than fried as much as possible.  Try not to eat too many empty calories (high-calorie foods without much nutrition).  Drink lots of water.  Pretty common-sense stuff, really.