Hello & welcome !
I'd suggest starting rearing purely for meat until you get lots of experience with the pigs before you even contemplate breeding - SO much to learn to be sure you're doing the right thing (for you and the pigs)
Go for a breed with floppy ears - they're usually more docile and easily managed for beginers (avoid Tamworths unless you enjoy causing yourself stress
, but thats just my humble opinion) I don't think it matters if you have boars or gilts, but you have to be more carefull around boars IMHO and there's a lot of talk of 'boar taint' but only ever having had gilts I don't know much about that.
Gloucester Old spots are really tasty, large blacks are, well, large
so lots of meat, Oxford & Sandy blacks are just so cute ! All the traditional breeds have different merits and everyone's got their own personal favorite.
Half an acre is probably about the right size for raising 2 or maybe 3 weaners up to 6 months for slaughter (others may disagree) if you are considering breeding (and I strongly advise you to WAIT until you've got lots more experience) you'll need considerably more land, you've got to allow for resting fields and have the ability to seperate sows before they farrow.
You'll have to consider housing - it need not be fancy, but should be
strong, watertight and well bedded. Also feeding and storage of feed should be considered to ensure you don't attract vermin.
Have a read through the posts in the pig section, get yourself a book (or 3!) Andy Case, Starting with pigs is good and perhaps most importantly find someone locally to you who keeps or has kept pigs - go and talk to them, see the pigs and the reality of keeping them. They need far more looking after and attention than sheep, cows or horses. Oh, and I'd definately wait til after the winter to get your first ones, there's no quicker way to put yourself off keeping pigs than trudging about in cold, wet, muddy conditions and it'll take longer for them to get to slaughter weight.
Good luck