Welcome to PGD.

I'd recommend finishing you text-based RPG before going onto trying your hand at graphics. However when you do, and this is from over 7 years of experience seeing new game programmers join the community, start with a clone of one of the classics. RPGs and those neat MMOs that everyone plays these days when done in a visual medium take tons and tons of resources to accomplish. This is why they are known as new programmer killers.

If you are serious about making games you'll need to start with small fun projects to start. You wouldn't believe the amounts of creativity that will come from tweaking and adding features to a pong/breakout game or some other simple variation on the classics.

Also be sure to check out some of the great stuff done by students over at http://www.pp4s.co.uk/ Lots of great examples and lessons there for getting into games programming.