Welcome to TRF Iris and I can assure you that you are among many, many royal friends here. I'm looking forward to seeing you in the threads.
As you've stated that you have a long time interest in Diana, Princess of Wales, I know that you'll find the many threads devoted to just about any aspect of Diana very interesting. They can be found here:
Diana, Princess of Wales (1961-1997) - The Royal Forums
Its a good place to start and actually where I started when I first joined here many, many moons ago. I've been hooked ever since. I don't do collectibles at all but my passion is books on the British royal family and its history. A lot of good titles can be found here.