I agree with FiB on the fence heights and Sabrina on the breeds
I love my Kunekunes and everyone loves the pork from them, but I couldn't be without my hulking great Large Blacks either.........everybody has their favourite
Kunes will do well on 1lb of pig nuts per day plus grass (they'll need half an acre minimum to see them through to slaughter at 10 months/60-65Kg liveweight) or your 'big' pigs will need 2,3,4,5 lbs per day depending on age and not quite as much space, finish at around 6 months and 85Kg liveweight (or possibly more if you choose Large White or Landrace
)
Don't mix the Kunes with the big pigs (I know some folk probably do) but I think the feeding regiemes are so different and the Kunes need the grass that the others dig up that if you're going for the Kunekunes (and it would be a great choice for a first timer cos they are just soooooo nice & easy to manage
) - keep them in their own space to get the best from them.
If you decide to get say, one of each of the other breeds make sure it's gilts you're getting as otherwise you might have quite serious fighting going on (but they could already be mixed by the breeder, in which case ignore that last bit
) But it's worth making sure they are all the same sex anyway - you don't want any surprises
HTH & keep us posted
Karen