If you want to get your first pull up, you need to start with the dead hang. You want to get comfortable with holding and supporting your own body weight.
A key thing to look for is to stay as still as possible. Don't be swinging around. Keep your core engaged the entire time you're hanging. When you can work your way up to 30 seconds pretty comfortably, then you can start doing scapula pull ups. More on that later.