hook beaks need grains that they can peal so a parrot mix will work
They will in general stay in the same area so if food is available they will stay in the same km or so
They do compete with our native birds and those that are already here so be aware of that.
From memory, the North Shore had quite a problem with them over taking some where so they trapped them and disposed of them.
Commercially, they are caught with a spring net that is on the ground. When the group is close enough, the net is sprung and traps them underneath. As mentioned earlier, they have very strong beaks so leather gloves are normally used