That's the polite way to put it; "Virgin Speech" is probably a bit too much down at the Club. First Speech would do me just fine.
It's not the first speech I've ever given - it won't even be my first time speaking to the club (fourth actually) - but I'll be speaking formally at Perth Speakers Club for the first time ((It also happens to be the first time I've worked to a deadline since I left school. I've managed it well, although I did feel a few twinges of procrastination.)).
I'm happy with my speech; I spent a long time ...