Bj's?

So me and my boyfriend have been dating for almost 2 years. He has never pressured me into doing anything I didnt want to do but the last time we hung out we were making out and he fingered me. Then he asked if I was comfortable with giving him a blowjob. I told him that I would try but I didnt know what to do and when I was about to start I panicked because I didnt want to be bad and I didnt know what to do. I told him the next time we hung out I wanted to give him one but I wanted to know if you guys had any tips? How do I avoid using teeth? How do I do it in general? Things like that