Yes, you can absolutely sell Clickbank products. Just make sure that you are sticking to the 2 links rule and that you are not pushing the product in your hub.
In your information box at the bottom of the hub, put your product links there. Make sure that your hub relates to the product you are selling and people will click on your links to find out more if it looks to be worth their time.
I would avoid trying to sell affilate products. There is too much of the same thing out there. Develp adn sell your own.