Consider HIIT (High intensity interval training) at least a couple days a week. HIIT usually combines resistance exercise with a fast pace to get the heart rate up. You can get a killer workout in 15 minutes. Try to avoid long periods of intense exercise. Overall, exercise does very little to create weight loss. Unless you are working out for hours each day, the total amount of pounds you'd lose over a year, solely due to exercise, is usually less than 5 pounds. HOWEVER, exercise has many, many other health benefits, that it really needs to be a part of our plan.
During the rapid weight loss phase in the first 6-12 months, or more, it is important to do some resistance exercise to stimulate muscle growth and repair. We all lose muscle mass during weight loss. It is unavoidable, and we want to try to limit that muscle loss, and the only way to do that is to work the muscles and get adequate protein to create new tissue. Unless you are full on body building, you won't gain any weight from working out muscles as your will still be losing muscle mass for a while, and it takes a long time to really build enough muscle to make a weight difference. Maintaining muscle mass also has a positive effect on maintaining a good metabolism as well.
Cardio exercise has many health benefits, but going too far can actually slow down weight loss when combined with a low calorie diet. If you are eating low calorie, which most of us are during this journey, extreme exercise can trigger your brain to really increase it's protective mode and signal your body that you are losing too much of your energy stores from fat and muscle. Your metabolism may slow down, and you may get hungrier for higher calorie foods.
Light to moderate cardio with some resistance exercise worked in will serve you well. It doesn't need to be over the top.
As far as food goes, once you start eating regular foods, don't be afraid to experiment a little bit to see what your body reacts to the best. The guidelines that most people receive are usually the same thing that's given out to every single patient, and it's not going to work optimally for everyone. We all have different gut bugs and bodies that metabolize food differently. It can take a while to find the right combination of things that your body reacts to the best. Don't get sucked into any particular "diet" other than using it as a starting point and tweaking as you move along.
Based on the research I've read, and what I do myself, I would recommend eating a wide variety of plants, choosing the highest quality protein (plant or animal based), and stay away from artificial sweeteners and ultra-processed foods as much as possible. Adjust a bit here and there based on what you can tolerate and what seems to work best for you.
Best of luck!!