We've never communicated before this, I'm not familiar with who you are, and I don't know if you even know who I am.
So, let's start at the beginning. Hello, I'm the Doctor, and I'm a Time Lord from the planet Gallifrey. I travel through Space and Time in a ship called the TARDIS (which is an acronym for Time And Relative Dimension In Space). I may or may not be a construct created by the Tesseract, still figuring that bit out. Hobbies include traveling through time and space and playing guitar.