This year I'm teaching three courses: pre-calculus (trigonometry with some math analysis), geometry, and Algebra 1.
This is the fifth year in a row that I've taught pre-calc using the same textbook, so I can recycle lesson plans from past years. I've taught Algebra 1 before, but since I'm using a new textbook I have to create all new lesson plans; at least I have experience in how long to spend on certain topics. I haven't taught Geometry before, so I'll be creating those lesson plans from scratch while relying on my fellow teachers to help me determine how long to spend on topics or the best way to approach any given topic.
That's a lot of new work, coming out of the gate.