My younger was the same way. She just has to be like her older brother. Cut up bananas, chicken nuggets and cheese, cereal, peas, rice, canned fruit chunks are all things that he can pick up by himself. If he is still breast feeding, or drinking formula, you don't really need to worry about solid foods supplying nutrition at this point, so if he eats only a couple of things it is okay.
Try finding chunky handled spoons and bowls that suction to the table/high chair...let him feed himself yogurt or apple sauce...you did say you wanted a mess to clean:-) Makes for good pictures, and lets him start feeling he can do things for himself like his older siblings.