Exercise! - ? re: exercise, fibro and back issues

I'm new here. Have 50 lbs to lose, have hypothyroid, fibromyalgia, many back issues-mild scoliosis, pinched nerves, arthritis in neck, lower back, bad right knee, hip problems.
I'm feeling way older than the 44 yrs I am.
I know I need to exercise but I just don't know which way to go with it.
I recieved 2 'walk away the pounds' dvds as a gift.
My chiro told me once that yoga was good.
I can't afford a gym or personal trainer so need soemthign I can do here at home.

Any suggestions? I have some stretching exercises and will start the WATP soon. I don't think I need to do it every day. What can I alternate it with, how do I deal with the pain from my 'ailments'?
So many questions. I just dont' want to do more damage than I have already.
Thanks for your answers

lol! I don't want to be a whiney but I forgot to add I also had a abdominal hysterectomy w/vag. cuff suspension and a bladder sling back in Sept 08. I'm still quite tender from that.

One thing about exercise is it can help you feel better. I have had back problems, knee problems and overall leg problems. I feel better when I'm exercising regularly.

You might want to look at some beginner Yoga dvds and definitely do the WATP videos. Walking outside can also be a good exercise. I would start with a few days per week and see about doing it every day.

thanks, sometimes my hips just hurt so bad when I walk, feel them crunching, or like they pop out of place.
I knowif I'd just get up and do something I'd be alot better off.

What beginners yoga videos would you suggest?

For yoga DVDs, it appears there a few good options:
Yoga for the Rest of us
http://www.amazon.com/Yoga-Rest-Us-Peggy-Cappy/dp/B0001IXT90/ref=pd_sim_d_5
Essential Yoga for Inflexible people
http://www.amazon.com/Essential-Inflexible-People-Maggie-Rhoades/dp/B000RE94LU/ref=pd_bbs_3?ie=UTF8&s=dvd

Those are some pretty gentle routines.