I recently wrote a bunch of basic exercises for learning the “Train Beat” which is popular in country, rockabilly, R&B and so on. You can play it straight, you can swing it, it goes nice with brushes or hot rods and you should work until you can play the song at the bottom of this post.
Work first on all the snare drum parts with foot pattern A. Then, when you’re comfortable with each pattern play through them in sequence. Once you can comfortably improvise moving from one hand pattern to the next, move on to the next foot pattern and apply to all the hand patterns.