A crescent wrench can work fine for removing bottom bracket lockrings. A hozan tool is a good investment too. I recommend buying a park crank puller. They work very good. You will also want to invest in a shop quality set of cone wrenchs. When you learn to adjust a few hubs you'll find loose ball to be a frustrating game but often rewarding.

Get the Shimano cartridge bottom bracket tool. You will have fun replacing old worn out loose ball bottom brackets with cartridges. I recommend using only japanese made bottom brackets. The newer ones from Singapore don't seem to have the same quality or longevity.

Start buying tools as you need them to make your own repairs. It adds up but buying invidual tools will determine how much you really need. I highly recommend the park metal tire irons. If you are removing an old tire these make life easy.