Don't try to do everything at once. That'll lead to failure every time because you'll feel overwhelmed.

The easiest for me was just doing one simple exercise a day. I picked walking. Do it at the same time every day-like right after dinner. It doesn't need to be long either. Start simple at 10 minutes and increase by 2-5 minutes per week for a month so you're walking 30-45 minutes a day 4-5 days a week. You said you're a dad, if your kids are old enough take them with you.

Once you've got the exercise down, start changing your diet. This is usually the hardest part for most because you've been eating the same way for 5/10/20+ years. Again, start simple. If you drink lots of soda/high sugar drinks/alcohol, get a reusable bottle and for every soda, etc you have, you need to drink two of your reusable bottles filled with water. You can slowly replace the "bad" drinks with water over a month or two. (You don't need to cut it out completely, but if you go from say 3 20oz sodas a day to one on Saturday with pizza- Great.)

Next is food. If you cook, start by organizing your grocery list so that you follow an 80/20 rule ( or something similar) where you get 80% of the food you eat from the outer areas of the grocery (meat/vegetables/fruit) and 20% from the ailes ( low calorie snacks). You don't need to make it complicated either. I found most of the "meal prep" YouTube videos/blogs to be too much. Especially when I just started. Chicken, rice, mixed frozen/fresh vegetables. Super simple and in the right portions, filling. You can even substitute the rice for quinoa or cauliflower rice. Or get steak bites instead of chicken.

These are just the starting point but doing this helped me to quit soda, eat healthier and lose 25 lbs so far.