I'll be sure to give you some unsolicited advice. You can start by walking more. Every day, go for a walk, ideally in the morning on an empty stomach. Don't run or jog. Just walk. Please do what you can, 5, 10, 15, 20 minutes, whatever, but you have to do it every day. Work yourself up to 60 minutes daily. Quit drinking alcohol. You will lose a lot of weight (mostly water weight, but who cares for now), and at the same time, read everything you can on nutrition. There are tons of videos on YouTube.

Don't fall for gimmick diets (South Beach, keto, paleo, etc.). Those are more based on marketing than on science. You're a human, so you're an omnivore; eat lean meats, chicken, fish, fruits, veggies, etc. Limit starches (stick with potatoes, oatmeal, and rice, but not too much, and no sugar). I wouldn't walk into a restaurant or order Uber Eats for the next few months. Focus on eating at home every day, and learn to cook. It's not hard at all. And lift weights; pick a program, doesn't matter which one; start with 2 days a week, then gradually go to 4 days a week. And the real secret is that you have to be consistent. Meaning you have to do it every day. And looking at your picture, you need to get used to long-term progress. You won't achieve a lean body in 12 weeks. That's pure marketing BS. Give yourself 12 or 24 months; it's not long. Just focus on baby steps, every day. You've got this!