Firstly: please take a moment to review our title. As we put it, you understand that the choice of the shirt comes after the tie. That is so much true that Hardy Amies used to state this: "in principle your accessories, such as ties and shoes, should be more expensive than your basic suit which, in this way, can achieve some reflected glory from them".
Then consider one second thing. There is only one rule: your personality rules. At least as long as you are picking an O-Blio tie, an accessory which is conceived for breaking the rules rather than following them.
Then, given these fundamental principles, you might still want your shirt to achieve some reflected glory from your beautiful tie. This is the moment when you should look at your collar. The collar, in facts, says a lot about your shirt: it'll probably tell you if it's a modern shirt or a classic one, definining, for example, if it's a slim fit or regular fit, if its cuffs are wide or narrow and if its sleeves are large or fitted.
So, the golden rule goes like this:
narrow collared shirts fit good with a skinny tie (knotted with a small knot)
wide or cutaway collared shirts fit good on a regular tie (knotted with a Windsor or Half Windsor knot)
Basically you wanna stick to this in order to knot miss the chance to let your shirt achieve some of that reflected glory.