Well with being vegetarians there's no way we could rehome a kid where s/he would be killed for food. But I love the idea of castrating them so that they will all be rehomed as wethers. Is 1/2 an acre ok for 2 goats? It's mainly loaded with trees though so would we need to clear all the trees first or no? How much would it cost to have all the trees cleared or is there a way to have it done for free? How much sqaure footage is recommended per goat in the pen & house? And how high to keep them from jumping out especially since we work during the day & wouldn't be home to make sure they didn't jump out.
Wether's are frequently raised for meat as well so it's no guarantee they won't be slaughtered. You may be successful in rehoming a few babies here and there as pets but I don't know how easy it will be to find good pet homes for kids year after year with people who know goats and are willing to take on pets. Goats can live a long time and finding a pet home that is willing to make that long term commitment can be hard. My last two goats just turned 10 years old and are going strong. I agree with the other posts who said that often times a "pet" home does not turn out very well for the goat.
1/2 an acre is fine for two goats. You don't need to clear out the tree's.
As far as fencing...goats are more prone to find ways to squeeze out or push a fence down if it's flimsy rather then jump over. If there is the slightest opening or weak spot they WILL find it and they can squeeze through ridiculously small spaces. We use 48" field fence with 4x4 holes and we run a hot wire around the inside about a foot off the ground to keep the goats off the fence. Otherwise they love nothing more then flinging their bodies against it with all their weight and scratching themselves as they walk along, they'll also stand on it with their front feet to look or reach over. They are very, very hard on a fence if you don't keep them off it.
As Cassie mentioned I'd suggest getting a good book and reading up on everything. There's just a lot involved in breeding, kidding and keeping up with a milking doe as well as routine goat care.