If you have access to YouTube, there are a lot of free videos that are very helpful and will show you the basics.
You can view free videos from PTC at:
http://learningexchange.ptc.com/
BWIR has free webcasts at:
http://www.barry-wehmillerinternational.com/user-resources/webcasts
You can sign up for these free webcasts, plus they're on YouTube.