Im a fairly new instructor, so I tend to make a lesson plan, I dont always stick to it, but it helps me think when Im up there.
What I teach depends on whos attending the class as well, if someone is grading soon then we do things that are on their syllabus are that they find hard and need the extra practise on. If there are a lot of begginers I tend to teach some ukemi exercises.
I always tend to teach some softer ukemi and a lot of sword work, relating some of the principles of Iai to aikido hand technique as well as that of aikiken. My sensei and our regional head are usually in attendance, so there is little point in me teaching what they do, as they can do it better. So I try to teach my perspective on things as well as some stuff that doesnt get taught too regularly and that people wont have seen. It seems to be working pretty well so far