I encourage you to save up your money and get the Enttec DMXIS. For $275 you get the dongle and the software. It's very simple to learn and use. It's designed for someone like you with a band or small DJ gigs to do some fun lights without a lot of effort.
Chamsys MagicQ is free software for a high end moving light console. It's very powerful, but the learning curve is VERY STEEP using it on a laptop without some experience using moving light consoles. They hope you will try out the software then spend several thousand dollars on an interface or perhaps the whole console. You can use it without those interfaces but I wouldn't recommend it unless you have some experience.
But be warned, it's very limiting. For my personal taste it's way too simple.