Isn't 8 weeks quite early for weaning? Mine are 10 weeks now and still getting 1.5ltrs a day from the bottle - but hen I am a softie with my (goat)kids....
Hope they settle in well, and yes, disinfect the ear regularly (either use the colourless spray or a Savlon solution). They can get infected at any time, it just takes a tight head squeezing through the fence, and you are back to that one....