I start by walking a few times around the ring doing circles, figure 8s, etc. Then go into the trot.
Mostly what I am working on now is controlling the speed with my seat. So I will go from fast trot to walk, back to slow trot, then halt, to fast trot to slow trot, etc without using the reins (well that's on a good day)!
I am also working on steering. We will set up cones, imaginary circles in the ground to follow, poles, etc. I try to use as little as reins as possible and just use my seat and legs.
And if we have time I work a little on cantering on the lunge line! Exciting stuff for a beginner haha.