You will need to keep at least two goats, one will be very unhappy without company of his/her own kind and become a pest. Also you can keep female goats, just don't breed them, or let the offspring suckle until the nanny dries up naturally.
They will need a shed/proper shelter, daily water change, fresh hay/haylage, maybe a handful of oats or similar and in winter probably a LOT of hay and some concentrate. They will need worming every so often, feet trimmed every 4 to 6 weeks, and goats absolutely thrive on human interaction. Oh, and they will do anything, absolutely anything to get to chicken food - with usually disastrous results.
Make sure any males are castrated - if there is an animal sanctuary near you, they would probably love to shift some wethers...
But please read up on goats BEFORE you get any!!!
If you only need your weeds to go - better get it either sprayed off or topped regularly. Cheaper too.... hay was last year over 4 quid a bale in our region...