What does your typical day/week look like, OP?
Walking is enough if you can fit it in, at least to start with. 30 minutes a day is plenty- just try to go faster and build up that way. Walk with an audiobook or music if you can, or in front of the TV on a walking mill if you can't get out.
Try some yoga for strength/flexibility/mind and body/sanity/mindset.
But mainly focus on what you eat and don't starve yourself or go too severe.
This is quite a sensible TDEE calculator. Knock 500 a day off to lose weight. About 1500 is a good start point for weight loss but adjust according to age and activity levels.
https://tdeecalculator.net/
Eat 25-30g fibre a day, 5 x veg, 2 x fruit, 80g - 100g protein for most people is enough and eating <150g starchy carbs seems to help also, and try to have whole ones if you have them.
Whatever you do, make it slow, sustainable, gradual and permanent and realise you will have bad days and weeks but they don't have to turn into bad months or years! When you have it right it just feels better when you eat well and you don't even want to eat or drink too much for long as you have got used to feeling healthier.