The best first workout for losing weight is the one you get when you walk into your doctor's office for advice. Everybody is different, and we have no way of knowing what underlying health problems you might have. Your doctor or health care provider will be able to set you up with a comprehensive program for losing weight in a healthy way.
I don't think you need to contact a doctor before using the workout thing. Most forms of exercise are healthy for the body. Mostly cardio exercises help increase heart health
The important factors are to choose which one you want to do
You should take 15 minutes to properly stretch before a workout. Failure to stretch properly can result in injury, and can also limit the size and strength benefits of the workout.
You should always eating a light and nutritious pre-workout snack before you start your routine. Lance Armstrong has a website that should answer your questions about pre-workout meals: www.livestrong.com/article/58800-preworkout-foods-eat/
You should eat a Meal before you start your workout and after
It is not mandatory but having a small meal before a workout doesnt hurt. It will give you the energy that you might require for a good workout. Remember not to have a full stomach meal before a workout as it is not recommended.
Persons with breathing problems who want to start exercising should choose a low aerobic exercise. People with breathing problems also should consult their doctor before starting a workout program.
People who already have kidney or liver disease or liver infections should also consult with a physician before using the drug. Women who are pregnant or breastfeeding should also consult with a physician before using acetaminophen
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I would recommend doing leg curls and stretches, they will help tone and hone your legs. These can be done in short intervals, and should not be overdone. Consult a physician before doing these tasks.
you should stretch your legs and arms for warming up
That depends entirely on the contents of your pre-workout supplement. You should always check with your doctor or nutritionist before taking, changing, or combining supplements.