If you are at the beginning of your career which it seems like you are, you might find that getting pictures taken at this moment, is not the best thing to do. If you don’t have a good photographer and you couple that with no acting experience, your pictures could very well turn out to be not very good, expressionless and blank.
First thing I would recommend is for you to start getting some training as an actress. Get into a good acting school or get a good teacher and stay there!
Secondly, have a look at this page on my site for new and aspiring actors. You will find a lot of information about head shots, how to find a photographer, questions to ask and how to get really good shots.
And lastly, just remember that you get what you pay for. If you want head shots for free, don’t expect a lot.