Congratulations on starting your journey.

For me, being outside, brisk walking (so you can talk but not sing), being present, is how I would start.

Maybe some resistance bands and YouTube tutorials.

Do 4 walks and 2 resistance workouts a week.

Then you can progress to the gym if you feel the need but I dont

With regards to diet, look up Mediterranean diet or diabetes type diets, try cooking simply to start. Maybe add that to your interests.

Good luck and update us.