Hello! There's a similar thread here where people are suggesting different ways to make comics: http://forums.tapastic.com/t/what-do-you-use-to-make-your-comics-manga/123
What operating system are you using for your computer?
If you're using windows then Paint Tool Sai is a great (FREE) program to get your started. I think the program is incredibly robust and useful. Not to mention that it doesn't have a high learning curve.
For Mac... I've been using Sketchbook Express but it's not nearly as robust, it doesn't really have any editing tools but it does have a great selection of drawing tools and the digital copic marker set it comes with is pretty nifty.