A lot of it depends on your management and setup so for example what one farmer does with his cattle can be irrelevant to you.
I can't stress enough how important it is to know the history and management of the calves before you get them- ensure they are from high health herds with no Johnes, IBR, BVD, low risk TB herds if you are in a low risk area yourself (your neighbour will not take kindly to you bringing in calves from a high risk area in the UK) and have had adequate colostrum at birth. Then talk to your farm vet who will be able to draw up a good health plan to incorporate vaccination, worming and fluke dosing and routine treatments.