I've never entered tournaments but I have landed a few good sized bass of a brush hog. The biggest thing is persistence. If you're going for bass learn how to look for underwater structure, terrain features, and understand basic fish behavior for the spices you're targeting. Have a very wide verity of lures to use, sizes, colors, shapes, from surface lures to bottom. Practice those casting techniques. There is way, way,way too much for someone to sit here and tell you. A lot of it is watching, learning, asking questions, practicing BEFORE you inter a tournament. I'm not saying you can't just go try it out. I would hate for you to get discouraged that's all.
PS- Soft plastics are my favorite to fish. Especially Baby Brushogs from Zoom Lures. Soft plastic fishing is a very slow relaxing way of fishing most of the time.