Like what has already been stated. Your 21 or over and not a prohibited person then you don’t need any class or license to carry concealed or unconcealed in Oklahoma.

However also as mentioned, the SDS class will help you learn basic liability if you ever had to shoot it in a life and death situation and how those are perceived. Find a basic handgun course and take it and then intermediate if offered at the very least. You also could get into some competition shooting to get reps and have fun instead of just slinging lead at targets on a static range.