What resources did you find helpful when changing your career to Project Management?

My transition was a little sudden, so the research came after the decision was made. I spent a lot of time on gantthead.com (now known as projectmanagement.com) and the IT section of Toolbox.com (I don't know if this still exists), reading articles, asking questions, and interacting with experts. I started attending local PMI chapter events and interacting/networking with members. I also took some inexpensive/free online classes - my employer gave us access to an online learning portal.

In addition to websites and blogs dedicated to project management, look for podcasts. Cornelius Fichtner had one that I recall listening to. If you want something structured, you could get a PMP exam prep book - there are a few good books that teach PM principles and refer readers back to specific sections of the PMBOK Guide (avoid trying to read the PMBOK Guide cover to cover, unless you have insomnia). I am familiar with Rita Mulcahy and Head First books; there are more. However, don't send them to a PMP or CAPM bootcamp. These types of classes are specifically for preparing for the exam, not learning how to be a project manager (even though they will use an exam prep book).

You might also look into workshops, like those offered by Fred Pryor, or free online classes, like those offered through Coursera or Edx. If your group is just considering making the transition, look for inexpensive options until they are more committed to the transition. There is an industry dedicated to teaching project management; it's easy to spend a lot of money on it.