It sounds like the problem you want help with is that your son is uninterested in expending energy on unknown things that might turn out to be boring – and/or that he is afraid of making a mess. You don’t give enough information for us to know whether his attitude is learned – e.g., your culture frowns on people who make messes, or you have punished him before for making messes – or intrinsic – a tendency towards OCD, or Asperger’s, or some isolated quirk of his personality; but you are right in wanting to help him work through this now.
If it’s the effort/mess that bothers him, my suggestion is that you start by agreeing with him that messes are unpleasant, but point out that most of the necessary things that adults do involve effort and mess: building a house, growing food on a farm, filming a movie, repairing cars, even cooking dinner makes a mess. And the really fun things people do are also messy: paintbrushes, pottery wheels, garden tools, camping gear, kayaks, surfing wetsuits, all that fun stuff must be cleaned and put away after use. Point out that it would be a good thing to get used to dealing with messes now, so that he can have a fun life as an adult.
Then, agreeing with him again that messes are unpleasant, and that having a clean house is important, say that it’s also important to have fun. Tell him that the key to making messes without people getting mad at you is Never make a mess unless you know you're going to clean it up. Tell him since he’s only five, you’re going to help him do the cleanup until he’s good at it. And for really big messes, you’ll probably be helping him until he’s 16.
Then help him take out his toys, play with him for a while if you can, and when he’s done, help him put them back. Keep helping him put things away until he’s comfortable doing it himself. Remind him as he gets older, and his toys become more complicated, that most things in life require effort, and if he can learn to do the boring parts quickly and automatically, he can enjoy the fun parts more. Hopefully you’ll end up with a responsible, competent kid who isn’t afraid of a little hard work.