replace the front locking hubs 4x4 on a 1981 cj5 jeep

how do i replace the front hubs and what is best to replace with

driver side front hub cracked I need to replace it or both ??

what should I buy whan replaceing it or both

I saw in 1981 they used 5 bolt (this is 5 bolt) pattrens

is it better to go to 6 bolt what all do io need to change if I could do it

(I drive it in the pasture 3 times a year or so )

what all should I order and replace extra parts while I have it apart

is their a better place to buy and get informantion on how to get it done books, u-tub , video .