You can start by messing around with the Creation Box: It is located on the left hand side which allows you to pick any tool that you are interested in using on the project. Your best friends are Filter, Blending Options [Stroke], Blend Mode [scroll down box on Layer Box: Located on the right hand side, all the way at the bottom], ah and what else .. well it may come to my memory.
PhotoShop is easy to use once you get the hang of it. Get some nature pictures and place them over each other, about five of them. Then use the scroll down box which is called Blend Mode on each layer/section. You'll notice that it blends well with the front and background layer. Also, mess around with Filter till you get the hang of it, or understand its basics. Well thats my advices from the surface of my knowledge.