I think there are many ways to practice. STORM ON recommends a three-step exercise like this video.
【Step1】
Step 1 is an application of Low Brace. Stand the paddle beside your upper body. Then, make sure that the paddle contacts the kayak (seam line). Let's just overturn half. Use the leverage principle to recover with brace and kick.
【Step2】
Float the paddle beside the kayak. There is no problem even if the tip is riding a little kayak. One rotation with the paddle floating. Watch the paddle and catch. Use brace and kick to recover.
【Step3】
Make a full rotation with the paddle. Rotate the paddle 90 degrees relative to the kayak while sinking. At this stage, the conditions are the same as those in "Step 2." After that, please recover with brace and kick. If you can do this, it's almost a storm roll. If the kick and brace help you recover, use sweep instead of brace.