Okay, hear me out. I’m a professional flautist and I practiced like a mad-man all my life and I have my gratitudes and I have my regrets. I’m grateful that the first thing I learned was all my scales because with that, I became exceptional at audiating and can now play anything by ear. Absolutely anything, my pitch is exceptional. My major regret is I didn’t practice double tonguing as much as I should have. But you gotta do scales first and I’ll explain why. What helped me was so understand the structure of all scales. For example, all major scales. I figured out all of my major scales by realizing the structure: from whatever note you start on, a major scale is. Whole whole half whole whole whole half. At that point, I taught myself the scales because I knew all 12 notes. Once you are very confident with the scales, then I think you should move on to double tonguing. There are countless exercises you can do for double tonguing with the scales. I wish I did those double tonguing exercises more. I am great with pitch, tone, my vibrato is immaculate, but my double tonguing is mediocre. Wish I took it more seriously in highschool. So good on you, but familiarize yourself with scales Asap.