That's great, but we need the engine model number. Craftsman didn't make the engines, and there may have been multiple engines in that model mower. There should be a label on the engine with model and type.
If you've needed starting fluid in the past, fuel system is suspect. Check the fuel line from tank to fuel pump. It needs to flow freely. Crud in the tank can cause occasional trouble until it blocks up good. If it doesn't flow freely, you can blow into the line, which can free it up. If that works, the tank needs to be cleaned. Hook that back up. If you can crank the engine over, remove fuel line from carb, crank the engine, and the pump should move fuel. Catch it in a fuel can or something. If both of those tests flow freely, it may be carb. I like to remove the bowl from carb, and put a new/clean fuel line, on the carb, and blow in the line. Move the float up and down, and it should stop flowing when you raise the float. When you take off the bowl, look in it. Is there gunk in there? There often is. Past that, pull the carb, remove float and needle, and blow all passages clean. I use carb cleaner, others may recommend something else. The main jet runs up the center of the carb, and often clogs. You can often remove it, by unscrewing it with a slotted screwdriver.