That is a nice Speedlight flash gun and will allow you a lot of creativity in how you use a flash. If you don't have a defuser for it I recommend one, especially if you ever want to do portrait and group shots as it removed the harsh flash effect you often see that can wash out colour in faces. But you can also perform a good result without by pointing the flash upwards so it bounces of the ceiling to give a wider, softer spread of light over your scene, which can work really well. Basically the idea is to not always have the flash "flashing" directly into the subject of the image, but defusing its additional light into the scene.

That flash is also capable of remote triggering which is great for macro photography as you can experiment with moving the flash to the other side of objects to create nice emulation and diffusion effects, especially with flowers and plants.