Breed? Size?
Personally I feed as much as they'll take x4 a day at that age. Once they're used to bottle feeding (and I find kids far worse than lambs), they'll drink what they want and that's the best guide.
At two weeks I drop down to x3 a day and start getting them nibbling hay and creep.
Good luck.
Oh, I found that kids were easier when both the milk and the bottle teat were quite warm (37-40C). I tucked a lot of kid under my arm to stop wriggling to begin with (I had to feed after they'd been on mum too, last year and they resisted). Eventually we all came to an arrangement that suited us