You don't even need to go near him. Head down the steps on the right hand side and you can head into a building to shield away from him.

You've no chance of making progress with that lack of patience.

learn skillz

Yup, you need patience. I remember I fought the crow hunter by mistake and then I refused to proceed until I beat her. So by the time I got to where you are, I was level 34 or maybe higher.

A lot of Bloodborne is about exploring w h at the best way forward is. If the enemies are too hard is there an easier location you haven't been to yet? If you levelled up woukd it help? Is there another way around?

E.G the section you are on, I sneaked around the left and up the ladder. Didn't know you could push him off so I fought him, but he eventually fell off.

My friend on the other hand had a really powerful weapon called the Canon I think. He got up and shot him once and the hunter fell off.

Do what I did, just don't kill him. It's not that hard.You are going to lose a lot of health to his gattling gun, but just accept that, and progress through the level. Once you get passed him, you don't have to worry about him anymore. 

Dude, I do not blame you. On my second time through, that boss remains the hardest I've fought. Like the others have said, it's almost entirely luck.

I got gud and actually killed him. (I was mostly just dicking around waiting for him to dodge-roll off the ledge, randomly poking at him to give me some room to move...and that killed him).

That said, Keep at it. Once he's dead, Old Yarnham becomes a great powerlevelling area.

Use the 2H axe and do a charged swing at him, when he's near the edge, and he'll fall off. Thing is, you really don't have to beat him to advance. In fact, beat the Blood Starved beast, leave Old Yahrnam, come back from through the prison area instead (beating Darkbeast Paarl), and you'll basically come up behind him where he'll instead talk to and be your friend, provided you promise to stop killing beasts.

I'm now at this place, should i run at him?

Okay so noob question here I don't think I have the ability to sprint. Does ever class have it or do you need a certain class?

Every class can sprint. You just have to press circle

Hold whatever your dodge button is to run faster. It does drain your stamina though. Like others have said, you do not need to fight him. You can run past the guns firing line and he's no longer a problem.