weight loss

Hi! I am here to ask how I can lose weight. I am 5'5 and I weigh 255. Yes I know I am overweight. But I decided that I need to lose weight for my kids. I want to be around for a very long time for them and to be healthy. Please comment down below and tell me or stories or give me advice. Please I am in deep need... this is for me but most of all my children.