In the seventies and eighties nearly every farmer had a couple of nanny goats to feed their lambs. Now, it's easier to open a bag of lamblac than to have to feed and house (and look after) two goats all year round. Lambs really thrive on goats milk, even if you only have enough goats milk to give them half milk and half lamblac it is worth doing.
However......
It's best to not let lambs suckle directly from the goat, for lots of reasons (eg, they damage the goats udder, could pass orf onto the udder, they produce less milk and for a shorter period of time than if you milk them, if a lamb dies, then you might have to milk the goat anyway). That means you have to fit milking into your schedule, and bottle feeding the lambs as well.
You also need to get the goats in milk, and that means they need to kid- so what are you going to with two goat kids who also need to drink milk? Fair enough, a British Saanen or British Toggenburg goat will milk on for two years, so it's only every second year that you get 2 extra goats.
Where are you going to find a stud male? A lot of Goatkeepers now CAE test, and you will only be able to use their male if you too CAE test.
It's a lot to think about Mowhaugh. You're right to start thinking about it now!
Beth