Artemis,
You asked how some of us got started.... Eight months ago I came to this board! Then went to a meeting, got a sponsor and starting working the steps. I kept my food plan very simple in the beginning: three meals and one snack per day at scheduled times.
I would look for a sponsor; someone who has the recovery that you would like to have. They can walk you through and help you define a plan of abstinence and food.
The workbook is awesome and that's how I work my steps. It's great that you can go to AA meetings. I went to many online meetings in the beginning but my face to face meetings I get so much more out of. We can help you here until you find a sponsor, if you need it.
You asked about WW "will it fit with OA?" That's a great thing about OA, each person chooses the best plan for themselves. If you like WW then I would try it. WW has a lot of desserts and snacky type food products, so, like Marny wrote, you may need to decide what foods you'd rather stay away from to avoid triggers.
Please let us know if you need help
Charlene