Do not rush for the first step. Work on breathing. In a shallow place, slowly lower the head, gradually empty the water and air, then come up and breathe. Try to run 10 times and then rest.
Learn the second step of floating. You must be able to submerge in water. Learn to float the turtle, breast, and back. Then we go to the next step. I will find the photos of the floatings and send them to you