I am not a bioinformatician, but I wanted to learn about bioinformatics. I read Beginning Perl for Bioinformatics. I really enjoyed it. It got me started on understanding bioinformatics. I think you will enjoy it. It explains how to code in Perl by just explaining to biologists: Here is the problem, here is the code to solve the problem, let me explain the code, move on to the next example program.

(I got my copy from the library.)