It sounds like you've got the tools for the job now, I suppose the next step is really to start working out how you want the game to work/play. This is the part that gets difficult for most of computery types, cause its best done without the computer.
I'd recommend you take a step back, work out exactly what you want to happen and get to doodling it out on bits of paper... then onto a nice bit of design. With something that can get as complicated as an RPG I would think its key to get the class structure and interactions down early on...
PS. On that note, I'd really recommend (well not really, but anyhow), checking out a certain UML editor.. http://www.newdawnsoftware.com/jose
PPS. Apologies for shameless plug