Is juicing good for losing weight?

I bought a lot of veggie but I can't seam to get them down before they go bad or no were near the amount in surpose to so I was thinking about getting a juicer. But how do I make green veggie like kale and greens taste good or do I just gag in down quick and how much veggie am I surpose to eat a day I think it 5 but 5 what 5 celery sticks ain't what they mean I know is it half cup or cup or what