Diet and weight loss:
Get an app like Macrofactor and a food scale for tracking food. Aim for losing 0.5-1% of your bodyweight per week.
Try to eat a gram of protein per cm of height.
Eat sufficient fiber from whole food sources however you can. At least 20g per day, if not 40g.
Try to get fat from healthy sources like polyunsaturated fats like from olive oil.
If will power is an issue and you have money to burn, just hire a personal chef to make all the food you eat according to the above constraints and eat nothing else.
Strength:
Get a copy of the third edition of Starting Strength to learn the basic barbell lifts. That'll cover the first 2-6 months of strength training. I'd recommend the Tactical Barbell books for more sustainable training after that.
Buy a power rack and weights (barbell and plates) and a bench from a company like Rogue (or check out Garage Gym Reviews for recommendations).
If you don't trust yourself to stick to a training habit, hire a coach who knows how to get any able-bodied adult male to deadlift 400+ lbs. A coach who doesn't know how is fundamentally incompetent.
Cardio:
Get a heart monitor like a Fitbit. Your goal is for all your cardio to get your heart in the 120 - 150 bpm range.
Start just going for walks. Listen to podcasts or something. Gradually increase the distance/duration over time until your walks are an hour or longer. Go for a walk at least 3x per week, up to more than 7x per week.
Or you could just buy a treadmill and put a TV in front of it and watch it while walking. Increase the pace or incline as needed to keep your heart rate in the right range. Maybe even have a rule in place that any passive consumption of video can only be done on the treadmill.
More info:
I'd strongly recommend binging the Barbell Medicine podcast for evidence-based recommendations that deeply investigate the benefits and limits of lifestyle changes for health.
If for any reason you can't sustain any of the above habits, just pay someone alarming amounts of money to keep you accountable. Like they should just show up to your house and work out with you or coach you.
I'd also strongly recommend some form of therapy if you're having trouble sticking to new behaviors that you recognize are beneficial and align with your values.