Got a date tomorrow - First timer need advice.

Lately ( about 1 year or so) i realized i am thinking about guys too so, right now I am not sure about my sexuality anymore but for long time thinking and processing things i decided give it a go. But sometimes i dont even want to think about it and sometimes i really want to try and understand myself. I met one guy that i like profile pic on social page and i want to try. It will be my first time, and we will make oral only, so no top or bottom. İf matters He is considers his self as a bi. And i can say i am close to bi too. Any advice?Sorry for poor english!