Just be friendly and be yourself
Some rapper once greeted with: "Thank you for being here today, you could have been anywhere in the world, but you're here with me and I appreciate it."
That was cute. Maybe something funny to liven he crowd. It should just be like
1) A greeting. Hey, Hi, Hello, Yo, Good-evening
2) A thanking. Thank you for your time
3) Introduction. Name. Song you're singing etc.
4) Extra cute saying, quote, joke, one-liner eg. Please put 911 on speed dial because I'm hoping my performance will be mind-blowing