Congratulations on you new acquisition! After a bit of practice you will really start to enjoy what an
airbrush has to offer.
As said above, videos and such are good, but don't get caught up in what is "right" or "wrong," or what works and what doesn't work. Airbrushes definitely fall into my 10/10 Rule: Ask ten people a question and you will get ten different answers.
There are so many variables that situations will be vastly different from person to person. You could have two bottles of the same exact paint and they might behave differently. For some jobs, low pressure is called for. For others, thinner paint is necessary. Just practice a bunch, and have scrap material on hand to test on before you start on the model itself.
Also, don't get caught up in quantities. One person may be able to use "x" drops of paint "x" amount of thinner, but it won't work for others. One thing that drives me nuts, is unnecessary frugality. I have seen videos where people have bragged about only having to use two drops of
airbrush cleaner to fully clean their
airbrush. If I tried that, I would have a stuck-solid
airbrush next time I used it. Cleaner is cheap compared to a new
airbrush. I also try to use proprietary cleaners: Vallejo cleaner for Vallejo paints; Model Master cleaner for Model Master paint; etc. Is this necessary? Probably not, but its what I do.