Welcome and congratulations on taking steps to quit for good. You will get out of this place what you put into it. My best tips are 1) post roll every day, figure out how to get help doing it if you have to, 2) read all you can to learn about the addiction you are battling- it helps and it sounds like knowledge about why you can't have "just one" was lacking for you before, 3) keep a record of your experiences here in your intro, so others get to know you and see how you are doing, and as a record for you about what you never want to go through again, etc. and 4) make friends here- for support and accountability. The stronger the network you build, the stronger you make your own quit.
Check your inbox, I'm sending you a PM with my number. I'm here to help, and a lot of others will too--- take them up on it!