We had dairy goats for many years... I always thought the milk from the Nubians tasted best....nubians also produce a little more milk for trying to keep a medium-sized family in milk whereas something like Nigerian dwarf goats produce decent milk, but in very small quantities... nubians get to about the height of a great dane and are fairly gentle... i never worried about any of my kids being left alone with any of our females (not the case with males)...my daughter regularly milked by herself even at 8 or 10 years old... my daughter loved it and would even volunteer to milk before school without being asked and even in the dead of winter... one of my sons was ok with it but didn't love it... two of my sons hated it...it will take longer to clear an acre than you think, but mainly depends on number of goats...yes, you can clear an acre faster with several goats but it will not be good for long term, if you wanna keep goats long term... bad for the land and the animals if they are above the land's carrying capacity... they should have more sprouting up in another area as they are finishing with what they are working on...you can/should supplement with hay and maybe a handful of sweetfeed/grain... more hay is required in winter.... invest in an automatic waterer... turn it off when temperatures drop below freezing 😁 (ask me how i know)... they usually will not try to escape if they have enough room and things to eat inside the enclosed area... for one acre, I would not do more than two goats....one would likely be best for that small of an area but get two because they need a companion ... do NOT get males (folks will try to give you males for free, but take them only of they have been banded and then for food only as they obviously will not provide milk which you indicated you want)... males should be kept ONLY for breeding purposes but for a small homesteading op, i would not keep any... ponds are fine... they kept my pond dam cleared... someone above mentioned them killing trees, but only small ones.... they will not kill the mature trees, and actually will help maintain a healthy piece of land by keeping small trees and underbrush from competing with the mature ones... field fencing will work fine... strap some on your gates as well... go ahead right now and start trying to line someone up to milk if you are the kind of folks who like to go on a trip to the beach occasionally, otherwise you will be disappointed and will not get to go 😂... I'm sure I am leaving a bunch out, like spending the night in the barn on nights when they are about to birth kids, but you can ask whatever you think of and I will be glad to give you any info I learned so you will not have to learn the hard way... overall, it is a really rewarding undertaking, although time consuming and tough at times....hope this helps....holler if you need anything