You may not be able to get unemployment benefits: you fought with a co-worker. Engaging in fighting by what is often termed "mutual consent"--i.e. when you were both "spoiling" for a fight, or inciting each other; or when you were pushed, but then retaliated by punching or escalating the conflict--is often just as bad as being the aggressor. You also write that you had previously received disciplinary actions, which means that you, too, were a "trouble maker" from your employer's point of view. While you can and should appeal the denial and tell your side of the story, be aware that under the circumstances you describe, you could be considered to have been fired "for cause," which is grounds to deny you unemployment.