“Hello everyone—thank you for having me. I’m delighted to be here” doesn’t really cut it as the opening to your speech. You need to start off with something that will capture the audience’s attention and bring energy to yourself and to your presentation.
If appropriate, share a short personal story, a brief commentary on a recent, relevant headline, or a quotation.
This will help get you over any opening jitters, get you warmed up and hopefully will have the audience impressed with an opening (and a speaker) who is more interesting than they expected.