Hi op, I'm the same weight you are now and I've just lost 2 stone. Still have another 8 to go. It seems so daunting, but the trick is to make small changes that are sustainable yet build up healthy habits. If you do too much to start with, you will get overwhelmed, bored, and/or frustrated and stop, thus ending up back at the beginning.
What small things do you think would help? For me, it was making meal plans every week for my 3 meals a day(or making them 2 or 3 weeks in advance to ensure I don't have an excuse to order takeaway) and sticking to them.
Taking water to work with me instead of fizzy juice was another small, sustainable habit that's been helping me lose weight.
And finally incorporating more steps into my day, eg. Talking the stairs at work instead of the lift, putting on my earphones when cooking dinner and dancing round the kitchen 🤣 etc.
I wouldn't worry too much at the minute about workouts and exercising, weight loss mostly comes from a calorie deficit, not burning calories.
I would focus more on building small yet effective healthy habits until they become second nature 😀 then you can go from there when you've got a handle on the healthy eating.
Two things I have found to be useful are take photos at the start and throughout your journey, because you often can't see your progress with you look in the mirror. When I compare pics of me at the start compared to now I am completely amazed by the difference.
And most importantly of all, have patience with yourself. It's going to take a long time to lose a lot of weight. That shouldn't put you off because the time is going to pass by anyway, so don't let this make you feel like weight loss is insurmountable. It isn't, and we're both going to kick obesity's ass 🙌 good luck op, hope this has helped.