Where to start ?

First off, I must say you have one of the most informative, amazing websites I have ever seen. Your website is quite extensive & inspirational. Anyway, I am truly new to all of this. I would like to cleanse my body from years of poor eating & general abuse. Where do I start?

I dont know if I should do everything at once or one thing at a time?

What would be first?

Your help would be most appreciated. Thank you for your help & for helping people like me learn there is another way.
God Bless.