Hazencruz Vanderbor

I have had premium for about two months now, and I'm thinking it might be cheaper for me to just use my tier for the mainland to put my home on. I don't know how to use it, and I've been searching the website for hours. Where do I go to actually claim this tier? How do I see what Land is available and where? Sorry, this has probably been asked before and answered but I just can't seem to find the info.