You do need to upload photos so people can actually see what you have. It's easy. Go to your home page and click on media and follow easy instructions for uploading photos. Photos must be in .jpg format (I think that's the only one that will work, not positive).
Then, if you wish to add them to a post, type your text and scroll to the bottom of the page. Your photos should be there. Click on the photo(s) you want to add to your text, click on preview to be sure they're on there and what you want to post and then click post reply.