Have over 2 years of charter experience in the kimberley, my advice is keep it simple.
Meaning everything you do as a CPL holder can be broken down into a list of simple things, do these and you can handle most situations.
Some of these are:
1) Take at least 15 mins to complete a walk around/preflight you never know what you can miss when you rush
2) Keep neat and tidy when with passengers (especially includes language) comes down to being professional
3) A little bit of forethought goes along way, e.g does a destination have ATIS/AWIS found in a current ERSA that you have actually read!!
4) Everything is yet to be learnt, but don't forget the basics along the way.