start a 365 project where you post a photo every day on some blog/facebook/whatever
it forces you to take a lot of photos, think about future ideas, put those ideas into action, and want to improve your skills
DX means crop sensor right? then the 50mm would become more of a portrait length lens which i don't find very useful for anything outside of portraits. a 35 would complement it well. i love 35 on both crop and full frame
50 1.8 is great for indoors though....