Auriyas

Alright, this is my first level 50.. I've never dealt with doing enhancements much. I've always just worried about leveling... Now that I just hit level 50 I can't find a level 50 vendor for enhancements. Where do I go? I don't even know where to begin with IO's..

I don't care abot being the best or what is op...
I'm just torn between Electric Melee and Energy Melee.
What are the pro's and con's of them? I've been trying to find research everywhere in the difference of the two but fell short. Thanks in advance!

I'm not looking for the most "uber" which is best in PvP blah blah... I'm just new to the Stalker type and I'm torn between Ninja Blade vs Dual Blades. I guess my question is what are pro's and con's of these two?