So I have arranged my first gay experience for today.

I kinda had a little bit of an experience with this guy one time. He showed me his dick and I touched it. Put it in my mouth for just a second. He did the same but I couldn't get hard. Today I plan on doing more than before. What should I be expecting? I'm really nervous. I thought about doing anal but I just don't know. I'm straight but a little curious. Any thoughts or advice please?