Hi welcome to the site =)
Anywhere in between 6months and 1yr should be fine. Im not a 'pig hunter' but ive been a lot with my dad, and dad reckons thats a good time to start a dog. We currently have a 3 month old pup (bull arab x mastiff/dane/rotty) and dad is going to wait til his closer to 1yr old, as he doesnt want Jed to get injured too young? But many ppl start them young.