different for everybody. i don't think there is a fixed criteria for the time and order you must progress and I don't think they should be it all depends on how you both feel. holding hands, do that whenever, next time your walking alongside him and just slip your hand into his. I'll almost guarantee he'll like that. the rest (caling bf/staying over) is completely up to the both of you whenever your ready. i think personally its better to say your seeing someone instead of bf/gf but that's personal preference. try inviting him in after a date, see what happens. I would say steer away from staying over after the first few dates but everyone moves at different speeds its more a case of when you're comfortable and when he's comfortable to move to the next step