Mages like him do very, very well in a 1v1 situation. With top being one of the longer lanes have to be able to deal with 2v1 situations as well. Bot lane solves this by sending two people down there, but you have to rely only on yourself.
Most champions can make it work, but it takes practice. I would highly suggest starting with a more typical top lane mage and using the skills you learn to make someone like Malz work. Take easier knowledge and transition it into something that better matches your own style.
I'm not saying Malz won't work, but he is definitely not a good starting point.