I'm not in the best shape currently due to chronic conditions but several years ago I went from close to 400lbs down to 150lbs in about 15 months so I do know a thing or two about weight loss.
The biggest thing for me was cutting out all caloric beverages. At first that meant switching to diet soda and iced tea and then eventually just to water. After a while you won't want juice or pop at all, you'll crave only water. I dropped 25lbs pretty much immediately just from this change.
Next was tracking all my food, at first just tracking things as I ate them to get a handle on how many calories were in my favourite foods and then eventually I was planning my meals the day before in the MyFitnessPal app. Seeing the amount of not only calories but sugar and sodium in the things you're consuming will change how you eat.
For exercise I got myself a trainer for the first year and she was fantastic. I recommend getting some outside help at first even if it's just for a few sessions because it gives you a foundation. Tons of trainers are doing discounted online sessions at the moment. She got me comfy with how different movements should feel and gave me a wealth of knowledge so I didn't feel so lost on my own workouts. At my peak I was working out twice a day, once with her and once on my own 5 days per week. After our sessions were up I kept the same pace just because it was second nature. Right after I hit my goals I got a fracture that took me out of my routine and then right when I was getting back into it they closed my gym so I ended up on a year long hiatus and gained back 50lbs. Consistency really is key!
With my gym closed I tried a few others but never really found one I loved so I ended up doing fitness classes (zumba and yoga mostly) at a dance studio and took off everything I gained back. It was easy because I loved the classes and it didn't feel like work. While I was back to the same number on the scale, my body wasn't as toned because I wasn't lifting. But it was an easy fitness regimen to stick to because it was fun, try to keep that in mind because you're way more likely to quit something that feels like work and you dread doing.
I started getting really sick a few years ago with autoimmune bullshit and gained back that 50 plus some extra due to constant pain and a whole whack of medication fucking my system up and just generally making everything exhausting. Thankfully I'm nowhere near where I started and even though I'm overweight I still have much healthier habits. I can't workout like I used to but I walk my dogs all the time and on good days I workout at home (zumba, yoga, HIIT, insanity, TRX). For now that's what I'm able to do so it's good enough for me.
The best advice I can give is be realistic, a lot of people have an all or nothing approach to weight loss and fitness where if you're not eating perfectly and lifting heavy everyday you're not doing it right but that's a great way to burn yourself out and lose all your motivation. Start small and easy and once you get a handle on one small change, add another. The changes in your body won't be instantaneous but they'll happen. Eventually when you start feeling better you'll want to challenge yourself and see just how much you can take on and then boom you've got a healthier lifestyle. Don't focus on a number on the scale or fitting into certain clothes, just make the changes that make you overall healthier and all that will follow.