Good on you that you are interested in learning dog training. It actually has a lot of similarities to bonsai. You have to be consistent 100% of the time for real success. You have to be aware of the details and be observant. And you have to practice a lot to be successful. Good luck! Start with your current dog, because it's never too late.
The thing most people don't consider about working dogs, including the herding breeds but especially Malinois, is that their only focus is you. All day. Every day. They don't want a life outside in the yard or even in another room without you. They never lose that focus, which is very different from a regular pet.