1. get the start right, the opening line(s) are the only ones which should be scripted and rehearsed. This just gets you and the audience into it and not allow nerves to play a part
2. follow some sort of story arc, usually three parts - problem / implication / solution
3. do it and then do it again, it is one of those skills which definitely is advanced through reps, even without consciously training the skills. You basically realise that the fears you had were irrational
good luck to all new speakers out there!
3.
And have organized thoughts. Don’t be a rambler!