Get yourself a good book, e.g. "Chaos and Fractals" by Peitgen, Jurgens and Saupe. It's among the most elementary on the subject. As you read, pick up things that you find difficult from other sources.

Fractals is now a broad topic that includes algebra, linear algebra, analysis, geomtery and more. There is no way one will be able to first learn everything needed and do the fractal thing later.