Detox/Rehab

Where would the best place to start after doing a brief detox. Im trying to find some resource who can help refer me to rehab. Don't know if I need to be in detox or not first. Also not to fond of having to be currently under the influence to be accepted but understand that will kind of prevent going through detox right away. Male in my 20s by the way so it can be narrowed to resources men can reach out to. EDIT: Thank you to all the responses. Definitely good info I need. I have gotten the help I need and am in the process of recovery. It was a scary few days and all your words gave me hope thank you so much.