How do I start a speech in English business?

How do I start a speech in English business?
Welcome

Well, since everyone is here, we should get started.
Hello, everyone. Thank you for coming today.
I think we’ll begin now. First I’d like to welcome you all.
Thank you all for coming at such short notice.
I really appreciate you all for attending today.
We have a lot to cover today, so we really should begin.

Welcome
  1. Well, since everyone is here, we should get started.
  2. Hello, everyone. Thank you for coming today.
  3. I think we’ll begin now. First I’d like to welcome you all.
  4. Thank you all for coming at such short notice.
  5. I really appreciate you all for attending today.
  6. We have a lot to cover today, so we really should begin.