I’ve missed the preamble to this thread, so I don’t know your exact circumstances, so this is just general advice, hope it is of some help.
To start with introduce yourself, explain very briefly what you are going to talk about, and why.
Your audience seems to be a small-ish class, and maybe you know them all already, but if not just ask them to quickly introduce themselves to the group. My name is, I work/study at etc.
Doing that brings the group in, lowers the barrier between you and them.
You know your material, right? Of course you do! Make it a regulated conversation between you and the audience, make it easy for other people to contribute. If someone asks a question you don’t immediately know the answer to, open it up to the group, and if that doesn’t work, get contact details afterwards and reply later.
Make sure you have your absolute, must-hit topics bullet-pointed in front of you (I like it on paper after a catastrophic tech failure many years ago)
When you think you need to move on, don’t be afraid to say so, and just do it. Remember, you are the one everyone is listening to, and taking their cues from. You’ll see who in the group is most involved - if you need to change the subject, address one of them with the new topic.
Don’t just stare down at your notes, or look at the projection of the slides on the wall behind you, with your back to the audience. Just don’t do that, look at the audience. It doesn’t even need to be eye contact, just face them when you are talking.
Most of all, in large friendly letters:
Don’t Panic!