New with a lot to lose

Hi, I've just joined up, I'm a 26 year old mum of three (obviously) from New Zealand and I've decided it's time I get healthy and lose the extra weight I'm carrying. I'm not totally sure how much I have to lose but I'm guessing somewhere around 40kg right now. I'm still finding my way around here, but I'm really liking what I'm seeing so far, and I'm feeling really motivated!