Welcome to Spark People !! What can an absolute beginner do for exercise ? You could take a walk. If you can't walk for more than 10 minutes, that's where you start. Your strength and endurance will increase with time and regular practice. No one says you have to workout for an hour at a time to be healthy. You can break your workouts up into shorter segments and still get all the benefits. three 10 minute walks space out through the day still adds up to a 30 minute walk.
Coach Nicole also has a seated cardiovascular workout you could try. If you find it difficult to stand for long periods, then sit in a chair to do some exercises. www.sparkpeople.com/resource/videos-detail
There is also a series of DVD workouts by Leslie Sasone called Walk Away the Pounds. Those are very popular DVDs that many members rave about. Many of her workouts include exercises with hand weights for some beginner strength training.
Also, when is the last time you had a full physical ? When a person decides they want to lose weight and be more healthy, their journey should start with a trip to the doctor. I know many people don't like doctors, but you need to know some important things like your cholesterol, blood pressure, blood sugar, etc... as you become healthier, those numbers will change.
When you get a chance, I highly recommend reading the blogs of member INDYGIRL. at her highest weight, she weighed over 460+ pounds. two years later, she's lost half that weight. She has some really good blogs about exercising with mobility issues. You might read this one. www.sparkpeople.com/mypage_public_journal_
The point ? Don't worry about what you can't do right now. Instead focus on the things you CAN do and go from there. Every little bit really does add up. Your strength and endurance will increase with time.
Why not start with a daily walk ?