
Welcome to the forum, glad you joined us!
Since you are new to chickens I’ll copy something I wrote years ago about mature mating behavior.
The rooster dances for a specific hen. He lowers one wing and sort of circles her. This signals his intent.
The hen squats. This gets her body onto the ground so the rooster’s weight goes into the ground through her entire body and not just her legs. That way she can support a much heavier rooster without hurting her legs.
The rooster hops on and grabs the back of her head. The head grab helps him get in the right position to hit the target and helps him to keep his balance, but its major purpose is to tell the hen to raise her tail out of the way to expose the target. A mating will not be successful if she does not raise her tail and expose the target. The head grab is necessary.
The rooster touches vents and hops off. This may be over in the blink of an eye or it may take a few seconds. But when this is over the rooster’s part is done.
The hen then stands up, fluffs up, and shakes. This fluffy shake gets the sperm into a special container inside the hen near where the egg starts its internal journey through her internal egg making factory.
This is typical behavior between mature adults. It doesn’t always work out exactly like this. Some roosters dance more than others. Hens don’t always squat when he dances. There may be some chasing and force involved. But as long as the hen is squatting when he is on top and she is not damaged it all works out.
As Egghead said, what you are describing is typical immature cockerel/pullet behavior. He covered it pretty well. Usually when they mature things settle down tremendously but often it is rough to watch them go through adolescence.
The only reason you need a rooster is if you want fertile eggs. Anything else is just personal preference. I don’t know why you want chickens or anything else about your facilities (the more room you have generally the better, especially if you keep a rooster), but you might want to think hard about why you should keep him, even if he is just an adolescent. You don’t have to eat him to get rid of him, you can rehome him.