Hi adriangump,
Many of the skills that you've developed while studying for the GMAT will transfer over to the GRE (although you the GRE places a much greater emphasis on a Test Taker's vocabulary knowledge - (including when to use certain words instead of others - and the Quant section has its own special question type called Quantitative Comparisons - QCs - that can be approached with similar Tactics to those that you use on DS questions.
The logical next step would be for you to take a practice GRE test (you can access 2 for free from
www.gre.org). You might consider working through some practice questions before taking that first practice GRE so that you can get a feel for the presentation of the GRE. Once you have that score, you should post back here (or you can feel free to PM me directly) and we can discuss the results and how you might best proceed with your GRE studies.
GMAT assassins aren't born, they're made,
Rich