I haven't posted on this forum in months, but for some reason your post has stuck out to me so I feel a need to respond!
The answer to your question is: you have already started to make a change! By making an appointment with your doctor, you've taken the first step. Make sure your doctor knows your plans for weight loss. Don't just let them do the workup and leave you hanging with the results and not knowing what to do with them.
Once you've gotten the OK from the doc, I suggest choosing ONE exercise goal and ONE eating goal to work on per week. Changing everything at once can be very overwhelming.
For instance, one thing you can change right now until your doctor appointment is changing what you're drinking. Drink water. Period. There's no nutritional need for juice and DEFINITELY no need for soda or other sugary drinks, even diet sodas. Next week, you can make an effort to exchange all your dairy products for low-fat or non-fat versions. Continue following those goals, and the next week try adding a fruit or veggie to every meal and snack. Then replace all your grains/pasta with whole grain versions. So and and so on. Week after week, those changes will really add up! You don't need to "diet" to lose weight! Ask your doctor what an appropriate amount of calories is reasonable for you to consume and lose weight. Keep track of your calories using the WebMD tracker or another (there are quite a few free ones!)
After your appointment, set some exercise goals. If you're not healthy enough to walk, there are many seated exercise programs out there. You can even find some free ones online. If your doctor believes you're healthy enough to walk, start by replacing just one time each day that you'd normally use your scooter and walk instead. Slowly increase the times you walk and decrease your scooter use. Then (probably after another OK from the doc) you can intentionally start an exercise program, most likely walking for a certain time or distance and slowly adding more each week. You will also want to look into some resistance (weight) training. I learned the hard way that you will lose muscle when you lose weight if you don't make efforts to preserve it!
There is a lot of information out there. There is also a lot of misinformation. It can be overwhelming; be discerning about information you come across (yes, even info I've just given you! I'm not an expert...just someone that's been there and done it!) You can do this. It is possible. It won't be easy but it is manageable. And totally worth it!