Are you specifically interested in immunology? Computational biology is a pretty broad umbrella. My personal experience was learning bioinformatics, which was h

Are you specifically interested in immunology? Computational biology is a pretty broad umbrella. My personal experience was learning bioinformatics, which was heavy on Python and genomics/proteomics. A brief search for comp immunology turns up things like data mining and mathematical modeling, I would assume Python and R would be a good place to start. You may even be able to find some lectures that cover some of the basics online.