Hi-ho there. Welcome to the forums. Feel free to check out the FAQs and other stickied threads at the tops of the forums for pointers. In fact, feel free to dig through the whole lot - it's what they're there for, after all.
What sort of programming experience do you have already? If you already have some projects under your belt you could try revisiting them in PHP - that can give you an idea about the sort of things it's a good fit for and what it's not so good for.