We're on Week 2 of the lectures (https://www.cs50.net/lectures/). Try to watch them and/or do the readings before our next meetup. If you're starting from Week 0 still come out because those who are ahead of you can help you out.
Prerequisites: None. CS50 is designed for students with or without prior programming experience."
Course link: https://www.edx.org/courses/HarvardX/CS50x/2012/about
Course link after April 15, 2013: https://www.cs50.net/
Programming in C (http://www.amazon.com/Programming-3rd-Edition-Stephen-Kochan/dp/0672326663/ref=sr_1_1?ie=UTF8&qid=1364174463&sr=8-1&keywords=programming+in+C) (paid)
How Stuff Works, C (http://www.howstuffworks.com/c.htm) (free)