IT dept internals

We need help in finding good resources on following.

We are an IT dept in a mid-size bank. Besides production site we feel need in R&D site(s) and maybe labs with different usage regulations.
Links to best practices and samples are needed.

What are the typical IT roles (CIO, architect, software developer, project manager etc) and their functions, requirements to the employees skills and preferred personality (pedantry, exactness, erudition etc) for the roles ?

Thank you in advance