I'd say learn python first on it's own if you don't know it already and then start hanging out around a bioinf open source project, step by step understanding the various terms and handling simple tasks until you feel confident with doing more. One project to try out: https://github.com/biopython/biopython . But there are many more you'll learn about as you progress.

Just keep in mind it's a very vast field and scientists usually specialize in a tiny part of it so don't go too hard on yourself.