Welcome from one who knows exactly where you're coming from!
:)Hi - welcome to the site (that's if someone who joined 2 days ago is allowed to do that!) Having yo-yoed for years I think your approach is a really good idea - I believe that diets can work for some people but that many others just end up yo-yoing. I'm sure you'll get the support you're looking for here - like me you'll have seen the inspiring posts and offers of support.
My doctor advised me that to lose weight because I have high blood pressure and osteopenia (the precursor of osteoporosis) he said I eeded to reduce the number of calories I was eating and adopt a healthy eating regime. When I asked about exercise he said that 30 mins gentle exercise a day was advisable and would improve my muscle tone, blood pressure, wellbeing etc but it would be the change in eating habits which would contribute to the vast majority of the weight loss - I also checked that via the web and discovered that you had to burn 3500 calories to lose a pound - the article went on to say that 1 hour of aerobics generally burns of 400 calories whilst eating 1500 calories a day usually result in a loss of 2 lbs a week!
That was 2 years ago - I was 14 st 2 and got down to 10st 13 within 18 months following the Slimming World diet which I enjoyed - but since I went on a special holiday 2 months ago I have put on nearly 2 stone. :mad: I'm now trying to lose that cataclysmic gain by healthy eating, gentle exercise and support from this site. I'll look out for your posts and wish you luck on your weight loss.