Run the students through the hour of code stuff on the courses page. At the end there is an arena they can create code for and compete in. That is pretty much all you will have time to do. That would all be free.
Make sure that you play everything out before hand.
You can find premade lesson plans and some posters on on this forum post. The posters are good for putting up to help the students, but you won’t need all of them, probably only the first 4.
I run the class as an elective and have found the most helpful thing is to give students plenty of time actually code.
Also, create the students accounts before the first class, or you will spend 40 min just signing kids up.