Get a cheap set of bits off ebay. Consider them expendables. Get some scrap wood. change the bits and have fun.
learn about bit height. it has interesting effects. learn off the cheap ones how to use the router, Learn how feed rate changes with speed. if you burn a bit - who cares? And you will burn a bit learning. You will burn wood, You will notch wood. but you will learn how to use the bits and then you can get the good ones.
the bits, the wood and the feed rate all interact.Cut grooves, pockets, cut up, cut down. cut inside corners, cut outside corners, cut circlkes. use fences, Just experiment.
The old sages are right. when you need a bit for a project get the good one. Pay the bucks for the good bits. But until you are a sage, get a cheap set and practice on 2X4, plywood, particle board, plexiglass...
Just have fun, AlWAYS BE CAREFUL _ OBSERVE SAFETY PRECAUTIONS - experiment with the cheap set on scrap wood. Remember a lack of caution can cut a finger or two.