Primered car, needs fixing, and then what.
You need way more filling and blocking.
You need to mix to the ratio listed on the tech sheet for the product.
You need to clean, adjust and have your gun at the correct pressure.
You need to control your hand speed when shooting and use the correct overlap.
You need to have surfaces clean.
You need to apply your product over the recommended surface finish (did the tech sheet say to apply the product over a 220 scratch?)
You need a water filter on your air system.
You don't need a good gun to shoot primer. Hell, you can apply your primer with a foam roller if you want, it's going to be sanded anyway.
You have a long way to go before that's ready for paint. Remember, any defects you can see in the primer will look 100 times worse once you put a shine on it.
I would recommend White if this is your first paint job.