Food works wonders. Plain on offering grain to the calves after a week or two of age. ( we start offering them grain at 3-5 days.)
It even helps if you wear the same clothing or same type of clothing, I.e. If your wear a ball cap, keep wearing it. Bovine eyesight is not the best.
Cows are curious and will investigate you... just move slowly, don't look them in the eye. Great places to scratch when they will let you is the indentation on the poll ( behind the horn ridge- they can't reach that) and long scratches along the neck. Between the pins, but only after they trust you! Do you have a bag of lime around? Cows LOVE that. Lightly dust your arms or part of your clothes and they'll lick you like a salt lick.
The first thing I would build would be a small corral with stocks - and a walk through headlock.
Do NOT play with the bull. I have been hammered by one, and quite honestly will not keep one around if I can help it.
Jersey cows are milkers, so they should have been handled ..... to be milked. Unless they are cross breeds? Do you have pics?
A Friesian ya mean ? That would be a Holstein-Friesian, a "regular" black and white "kitchen cow." You wouldn't usually breed a guy like that to a Jersey - the calves would be too big and would plug Momma. Ya sure he is a bull and not a steer? ( Does he have testicles? Unlike a horse, bull testicles are very easy to see.)
Have the dent in the truck to prove it! 
