How to start this losing weight journey

How do I start ??!? I'm so confused and loss , I just got out of surgery two weeks ago for Tumor removal in my head. The tumor caused diebities and other complication . but half of it is gone now. So now I'm out the hospital and taking meds to strength my body and get back to a healthy life style. My Main goal after I had the surgery is to Lose weight be healthy have a baby . but idk were to start with losing weight I've been eating like Crazy ever since I left hospital trying to control my suger level and keep it at the right measures, I get up in the middle of the night and snack like crazy. I sweat really bad now while I sleep idk how to change that .I hate to make excuses and whine but I need some help with this journey and support. I just bought a vivo 3 watch and its amazing still learning , and I won't to put it to good use .idk just need help getting through I'm a Great person sweet kind and I really am Strong and movated I just need a boost .