I will start with this and you can guide me from there about anything you are unsure of or if it doesn't actually answer your question:
The orbitals are spatial representations of a probability distribution for an electron with those particular quantum numbers. But the electron can be found virtually anywhere in space. For example, the electron in the 1s orbital has n = 1, l = 0 quantum numbers. This electron ends up spending most of its time in a spherical shell around the nucleus. But there is a calculable chance that the electron will be closer to the nucleus, farther from the nucleus (or in Cape Cod for that matter!) It is not by any means confined to that spherical shell.