cannabis review rate

I was just hired on as a freelance writer for a cannabis company blog. It’s my first time freelancing as I’ve always written for only myself. I was offered the position and they said to let them know what sounds like a fair rate per blog post and we can go from there. It can really range from like 500-1500 words depending on what i’m talking about. What should I be charging? I don’t want to ruin the opportunity but also don’t want to underpay myself.