I'm not too sure, but I'd think you'd just upload the PowerPoint like any other file. Still, you might want to see what the other members might say or have a quick search on the internet for a tutorial like Anglezoo said.
Yes.. If you just upload it the same way you would upload a photo or anything else it will work. When someone who has PP goes to the address from Internet Explorer the slide show will start to go on their computer. That's what you're trying to do I assume?