First you need the key to be in the mixolydian mode because the I. chord has a dominant seventh added. When you add a seventh to a I. chord in the major mode it is a major seventh and not a dominant seventh.
Then you need to borrow the IV7. and the V7. chords from other keys because they don’t naturally exist in the mixolydian mode with dominant sevenths. You would borrow the IV7. from the dorian mode, and the V7 from the major mode.