Too early to put any advanced techniques to practice. We're still in the stage where we're going to be discovering a lot of new things. Some will be useful, but most will be utterly useless and won't see much application. There's not much you can do with the demo alone, since most advanced techniques that will be discovered will be character specific or otherwise situational. For now, practice your pivots (tilts, smashes, jumps), and don't forget the importance of the basics such as spacing. What more you can do is just try to get a good feel for the mechanics. Get comfortable with the ledge, diving deep, and making plays off the stage. Learn intricacies of grabs and throws and how they directly link to other moves and approaches.
Do this until you can start playing with others. Then abandon CPU training and start learning the basics of mindgames and reads. Players having the ability to adapt to play tactics is largely what your competition is going to be in any competitive environment.