Accuflex, its been almost two weeks since you started this thread. Have things calmed down, or are things still going on? Of course, people who have gotten into fights are going to tell you to try to get out of it. They are just trying to tell you what they know from experience. One thing about fights. They can actually be traumatic. If you do fight and nothing more comes of it,and you lose, you will lay awake at night thinking about all the ways things could've been different. You may feel humiliated, embarrassed, and wish it never happened. If you do win and nothing else comes out of it, people won't care. You might be the talk of the school for about an hour, but not the hour after. No one remembers fights but the fighters. And when people do talk about it, don't think that it will be in a positive light. Some people may think that it was cool and fun to watch, but nothing more. And the most important thing: females aren't impressed. Oh, some may be, but they usually aren't worth impressing in the first place.
Maybe none of that has nothing to do with your situation. I don't know. I do know that if it is happening in school, it could be over a girl, general dislike of each other, bullying, or some other school-type situation. You never told us.
But for someone who has never been in a fight, there's nothing here that we can tell you that will give you some special ability to kick ass. There is no secret magical martial arts move or technique that will make you invincible, or give you ability to guarantee victory if you fight. Maybe thats what you came here for, but there simply isn't any such thing. That's why many fighters train in many types of striking AND takedowns AND groundfighting AND submissions. There's simply no way around it, you either study it and learn it or you don't know it. You don't know if your opponent will be weak or strong in striking, or proficient or a slug on the ground. You MUST also know yourself! Its surprising how many guys (especially in school) will walk around like Billy Badass, ready to tear into anyone, without ever training for it, or even throwing an actual punch. They just assume that they will somehow develop fighting skills the very moment a fight starts. Or they make the assumption that size is the biggest factor in determining who will win a fight, so they pick on smaller people. You have to know your own weaknesses and strengths. Hows your cardio? Speed? Power? Will it be enough to beat this guy? How do you know? Hows your ability to absorb punishment? Many fighters go into the fight pretty confident-until they get hit. If your in a situation where you just aren't getting along with this guy for whatever reason, and you both are hoping for the chance to kick each other's asses, that first hit will quickly change that attitude. You'll go from doing whatever you can to hurt this guy to doing whatever you can to not get hit again. Unless the guy can't hit that hard. But how do you know? The guy may knock you out with one punch. you never know.
And I assume that with no training and no experience, that you will fight by your instincts. Nothing we can tell you here will make you NOT do that. Once the fight starts, you will forget anything you've read on here anyway. It takes practice to be able to keep thinking clearly during a fight. But if you fight by instincts, you will make mistakes. When the fight starts, you will instinctively swing like a windmill, thinking nothing of distance, timing, and defensive striking. If the punches that hit you hurt too much, you will instinctively cover up. You will instinctively turn on your stomach if you find yourself on the ground on the bottom. You may instinctively close your eyes or put your head down when you swing. There are many instinctive things an inexperienced person automatically does in a fight, but they are NOT recommended! (Unless, of course, you know what your doing, i.e.turning on stomach). It takes practice and experience to overcome these instincts. And if you can't fight without overcoming these instincts, you will make mistakes. Just hope that your opponent is just as inexperienced to not take advantage of them.
Enough people on here have told you not to fight. I'm not going to beat a dead horse. I will say this though: you want advice about fighting? Plain and simple: train for it. And don't expect to go out and tear through everyone you meet after 2 measly lessons, and one week of lifting. Even 200 lessons won't make you invincible. Or 2000. There have been individuals who've trained for years, and gotten KO'd in their first altercation.
I could tell you to just kick him in the balls, and he may be wearing a cup; to sucker punch him, and he may do it to you while your waiting to jump him; to pull a knife on him, and he may pull out a gun. Point is, nothing we can tell you here will give you an edge. There are too many possible scenarios. We can tell you to practice your left hook and right cross combo, and he may duck under and take you to the ground. We can tell you all kinds of things to do, but since there are too many possible scenarios, which one will work? Who knows until it happens. Which is why I said earlier that many fighters out there study many facets of self-defense. So they can be as prepared as they can for every possible scenario, whether it be standing up or on the ground.
So I'm sorry that there is no quick solution in learning self-defense. Your question is the same as asking, "I need to fix a car tomorrow, any advice?". Hopefully, putting it that way will give you an idea as to how hard it would be to answer your question.
But if your personal fighting record is 0-0-0, keep it that way. You'll sleep better at night. Believe me.