OK I am 5'10" and weigh 140 I want to lose anywhere from 10-20lbs before my wedding. What are some ways of going about that??

Be safe. Really your body should only lose 2 pounds a week. How far away is your wedding?

Its in January so I could lose 10lbs by then

That is very possible! Set your goal and stick to a plan. Sometimes it helps if you have someone doing it with you. Find a workout buddy! As far as a plan I can't help you there.

I'm one of the unfortunate ones that suffered with an eating disorder and I don't want to go back to that so I'm trying to find different alternatives