Photoshop and Lightroom

I just got my software for Adobe Photoshop 5 and for Adobe Lightroom 3 from the Internet yesterday. I've long been looking for a legitimate link since I already wanted to learn how they work, and finally saw one (which at first I thought was fake, but gave it a try) from Tumblr. But now that I have it in my laptop, I'm just clueless about how everything in there functions.