Hello! I just joined and am new to eating healthy

I have never followed a diet before so really hope I stick to it. I am the mom of a 29 year old autistic young lady so have lots of worries. I have had several back surgeries (amongst other kinds) and have been on permanent disability for several years now as a result. I also have numerous other health problems. All this has resulted in my gaining 100 lbs! I have lost 25 lbs through reducing some of my Meds but I really need to learn to eat properly and to try to find some exercises I can do. I would really appreciate any help and/or support I can get ’cause I have never been known for my great food choices!