When I first started teaching, I was fortunate to walk into a fully stocked Chemistry classroom. It was a Chemistry teacher’s dream room. Problem was I didn’t know how to use the stuff. Well, I mean I had a degree in Chemistry so I knew how to physically use everything; I didn’t know why I should be using it.
So, I went to the catalog and ordered some kits.
The kits have it all: lab manuals (teacher and student copies), everything pre-measured, all the right equipment, and expected results. Now I just had to photocopy everything (yes, I used to use paper. A LOT!!) and the lab would run itself.
Now that I had experience to guide me, I knew everything I needed for the lab. I found cheaper ways to buy the chemicals, I reused equipment from the kit, and I rewrote the lab sheet to make it work better for my classroom.
The best advice I can give anyone just starting out in teaching or teaching a class they have never bought before: buy the kit first. Let someone else do all the prep work so you can make the activity as meaningful as possible. Then go about making it your own.