Welcome to the forum, Luke!
The easiest way to resize photos would be to use a site like this: Photosize.com
Another option is Photobucket
. You can sign up for a free account, upload photos from your computer into your own photo gallery, resize them if need be, and post an image link when you want to include a photo in a post. I prefer this way of posting photos because you don't end up with any scroll bars or image file names around the picture. Plus you have control over where the photo appears in your post: before the text; in the middle of text; after the text. When you upload directly it automatically puts the image at the end of the text.