Advice: How to prepare myself for Adjunct Teaching
I am a biology education researcher at a large public university, which means I spend a lot of time reading about teaching techniques and analyzing student outcomes. I teach college biology courses regularly. I say all this to emphasize that teaching well is a difficult skill set in itself. Being an expert in a field is only tangentially related to being an expert teacher.

So, I am assuming that you not only want to get hired, but want to become a good teacher. I'll suggest three ways to become an effective (and hireable) adjunct.


Read a book on university teaching. Most are geared toward new faculty. Some examples are: Teaching at Its Best or How Learning Works.
Google for the journal on education research in your specialty. For computer science, it looks like Journal of Computational Science Education. Read through several articles to get an idea of what the current issues in teaching in your field are.
Get practice teaching. If there is a community college, liberal arts college, or university near you, email some of the faculty and ask if you can assist for free during recitations/labs and help grade exams. Effective teaching requires understanding how confused students think and lots of practice helping guide them over hurdles. There may be legal issues to overcome here, but hopefully someone will appreciate free support.


It's easy to Google "how to write a teaching philosophy statement," but a good statement requires you to have some teaching experience to use as examples. 

To summarize -- read up, get practice, appreciate that this is a new skill.