I'm a guy and I've been on both ends. Personally I love having mine fondled and squeezed (gently), as well as sucked. The one guy I ever gave a bj liked the same things.
But, based on stuff my male friends have said over the years, some guys don't like these things and some guys hate having their balls included at all. So, try whatever you think your guy will like, but pay attention to his reaction (or just ask if he likes it). We're all different.