You are welcome, just ask away. I am happy to advise and help further. I airbrushed walls… motorcycle tanks… car wheelcovers all the way to paintings you can frame.
My pdf would help you with a first set up of materials… if you use discord; it is the same name as here for me…

You can airbrush with the tool you have, but not a whole helmet.
If you would go for a beginners set up, they do sell easily on the airbrush forums again if it is not for you. (In NL and D)