If you want to learn a new subject I will strongly recommend you to take up a online course on that. That way you will be motivated to finish up the course and can see it through the end. Also, in a course instructor will take you step wise through the material as well there are additive benefits of assignments. So here are few online courses that I have tried.
There is this course on AI offered by UC berkely professor, Pieter Abeel. Here is the link to all the material of that course, http://ai.berkeley.edu/lecture_videos.html.
I thoroughly enjoyed the course because he explained things very well using the help of diagrams and all.
Another course that you can try is on Udacity. Here is the link to the course,
It is instructed by one of the author of famous AI book named as "Artificial Intelligence: A Modern Approach" by Russell and Norvig.
And I will recommend python as language because it is very easy to use.