I think anyone that knows anything about guitars knows of Dean guitars... and let me get this straight... you restrung a right handed guitar so you can play it left handed? That's f'n awesome... haha Jimi-style... but yeah, your guitar is probably buzzing becuase of the nut like you said. If you too it to a guitar store where they do guitar repairs you could tell them what your problem is and they can install a new nut for you... they also will probably change the bridge for you too. But as for learning to play the guitar... I am completely self-taught and I just started learning how to read tabs off the internet.. I learned a bunch of songs that I liked and I tried to challenge myself by learning some songs that I didn't think i could ever learn... It just takes practice and hard work. It's frustrating and it can be a long learning process but I suggest just getting some books and stuff for beginners that can give you a decent grasp of theory and all the stuff that goes along with learning the guitar. Good Luck!