61 year old MTF trans woman. What should I weigh to be considered a candidate and in which order should I have procedures done?

Without including pictures we can’t begin to make an assessment and assessments are what you need.
Obesity and weight loss is not primarily related to exercise but is almost exclusively related to eating habits. there are lots of sanitary people who are not overweight and there’s plenty of active people including athletes who are obese.
My first-hand experience has been that those who blame the lack of exercise or inability to exercise for their inability to lose weight typically are not successful until they commit to weight loss and change they’re eating habits.
In regards to the multitude of procedures you’ve listed I suggest you get an assessment for each one to see if you’re a candidate and get a better understanding of what each procedure entails and what it can and cannot accomplish.
Are the number Of procedures you’ve included is pretty extensive. I suppose perhaps the best thing to do is to start scheduling in person consultations with local board-certified plastic surgeons in your community to begin the process of at least discussing what you’re hoping to achieve. Each provider will tell you what their own recommendations are in regards to BMI for weight loss in order to be an ideal candidate.
There’s plenty of information with typical range is considered a healthy BMI.
Once upon a time for transgender surgery there were standardized approaches like the Harry Benjamin criteria.
That seems to have gone out the door these days. I suggest you choose the procedure that will give you the greatest at least risk and recovery first.
Best,
Mats Hagstrom MD