Whilst there are video’s out there if you google for them, the big underlying factor is you and your equipment. There are many variables - needle size, gravity fed or suction cup, type of air brush, source of compressed air (aerosol, direct pressure pump or storage tank), etc. Then there is the temperature you spray in, humidity, how heavy handed you are with the AB, etc.
So in reality, the best solution for you is to practice. Cost of paint not withstanding, it is better to ruin spoons or scrap plastic/models with your testing, than ruin the model you just built.
I would not use the H-40 you have as it will likely ruin your model. Get some H-20 or Tamiya Flat Clear for acrylic top coats.
Acrylics dry fast, so low pressure light coats sprayed with the AB close to the model works best. High pressure will flood and splatter paint if sprayed too close, and you will get a gritty, grainy effect if you spray from too far away, as the paint actually dries during the transit from AB to model. Thin either of the suggested paints by equal quantity of their thinner (for Tamiya I use their lacquer thinner, not acrylic thinner for a much smoother finish) and spray on pressure around 12-15 psi first, then work up the pressure or change the paint viscosity from there based on how your AB and air source perform on your test pieces.
Good luck. I hope you get the result you are looking for.