I’m not sure if you’re serious or not. 16 is kind of young to start. If you’re trying to convince anyone to start, I would say start to find a good match. Then present the idea to him after you already know a little about the girl. This way, maybe you can get him excited and interested. If that doesn’t work out, you can use that as a way to really show your point of how difficult it can be to find a good shidduch and how long it takes.
If this doesn’t interest him in the slightest, then he obviously does not want to get married at all right now, so there’s no point in pushing.