What should a new coxswain know?

I joined a crew team in my area around 4 weeks ago and I decided that I liked doing coxswain better than rowing. I know the basics of rowing and everything I’m just new to coxswain and I want to know what I should do and any tips on things. I also have a waterproof bag, notebook, first aid, and wrenches is there anything I’m missing that I need?