I used to manually select my color schemes with trial and error, but these days, there are a lot of tools to help you pick colors for your charts. The motivation for most of them is to help you visualize your data in a way that is perceptually correct. That is, perceived differences translated between your eyeballs and your brain match the actual quantitative differences.
While there are new tools released fairly often, I tend to stick to these four simple and quick ones. Here they are by purpose.