I have been following this diet for a couple of weeks now..
Breakfast banana smoothie (skim milk babana honey n frozen yougurt)
snack hot chocolate (skim milk no suger)
Lunch 8 corn things with avacado
Dinner lean meat with vegetables n brown rice
sometimes frozen yogurt for dessert
i also walk abotu 3 times a week
how much weight will i lose if i stick to this

There's no way to tell. You didn't tell us how much of each item you eat, so there's no way to determine total calories consumed. You also didn't tell us how far you walk, or how fast, or how much time it takes, so there's no way to determine total calories burned.