Products we recommend for cleaning and painting 3D prints:
For spray painting you don't necessarily need an Airbrush. You can simply get spray cans of paint from your local hobby shop, Army Painter, Tamiya, Vallejo, or any major hobby brand:
https://www.hobbyrama.com.au/hobby-supplies/spray-paints/
If you want to invest in an airbrush we recommend the Iwata Eclipse CS.
https://www.iwata-airbrush.com/iwata-eclipse-hp-cs.html
For quality fine painting we like to use Army Paints:
https://www.amazon.com.au/Army-Painter-Miniature-Painting-Warpaints/dp/B01MTXRUUT
Sanding TWIGS and Model Filing Sets on Amazon for cleaning: