Hi! To get you started: read the MKOmmunity FAQ to avoid misconceptions. Check the HTML FAQ for a better writing performance. Turkey Shoot is a place for even the silliest questions and m0s3pH's thread sheds more light on what this is about. Regard the Fan Sub FAQ if you are a fan artist.
The most popular boards today are General Discussion, Mortal Kombat (2011), Fan Submission and DC Universe Injustice albeit all boards are in use somehow. The staff is there to help you further when necessary. Welcome! Zmoke