To start your Computer Vision career, it will be beneficial to acquainting yourself with some basic calculus. It is in large the foundation on which the Computer Vision algorithms are built. In any case, you should become familiar with Python or C++ languages next as the most developed Computer Vision libraries are usually either present in or made for these two languages.
Learning the Computer Vision itself right now is remarkably easy and accessible. You just need to subscribe for one of the numerous Computer Vision courses, for example, the famous Deep Learning specialization by Andrew Ng, if the goal is to become familiar with Neural Networks. During this time, it is a perfect moment to start making some starting Computer Vision projects yourself to try to be more used to its specifics and methods.