Hi izaack and welcome to the forum.
it happens there is another person in the same situation as yours who recently joined ; i recommend you read
this thread for a discussion of why it's best to avoid using drm (don't make the same mistakes the film and music industry made before !).
there are also plenty of other discussions about drm on the forum ; please feel free to take a look around, i'm sure you'll find them very informative.
it's great to see more and more people getting interested in ebooks and we are always happy to discover new ebookstores and publishers. i'm glad you're taking the time to learn about the technology before you start, and i'm really happy to see that you are planning to use the new industry standard format epub. that is a big step in the right direction for ebooks. you'll find plenty of information about epub around here too ; please take a look at the
epub forum for specific discussions.