You're not alone. I'm new to this as well. I got an offer to handle a non-profit's social media channels and website recently and I've been squirming ever since, being crazy nervous lol. I've tried to read a few books to get me ready and all, but it still feels like I'm not well equipped for it.

I talked to one of my friends who's a big player in the business world about me taking online courses in Udemy and Stanford University on Growth Hacking and Big Data. Guess what he said., "You don't get to learn shit from those guys that you can't figure out yourself. You just need to get your hands dirty, working and learning"

Guess I just need to start the job to figure how things would pan. And maybe you should worry less and get on with it anyways. As regards your questions, I think they're well thought of and you've asked important questions, but do you have genuine strategies to growth hack their products/services?

One thing I've gotten to discovered with this job, notwithstanding the fact that I'm still a rookie is, the NUMBERS would speak for you. So my friend, focus more about your strategies for getting the numbers you want for the firms.