It's really down to personal preference, do you want to wait 2 year till they are milkers or develop a bond with kids and teach them your ways. This is my experience: I started with a 2nd kidder milker and and a kid. It was hard going when milking for the first time but you will have that anyway till your hands get in shape. My milker was very well behaved and was so easy to manage being well trained and done it all before. The kid was a nightmare and due to my inexperience got into bad habits quickly.Now I know how to train and manage youngsters and young milkers I have no problems. Research what kind of dairy goat as there are many with different quality's. Look at the British Goat Society website it has loads of info. Also links to local goat clubs of which they can give you hands on advice and contacts for the type of goat you want.
I have tried the half and half system, I have had it work well and also a disaster, I have found it often depends on the individual character of the goat. First time kids shut off at night then milked the milker in the morning and gave the kids some milk in a bottle then they all went out together. Just check milker empty at night. Gradually shut them off to wean them. Next time I did that I wanted to keep the kids and run the milker through. Disaster they would not wean despite being seperate for 6 months. So I had a goatling who would suckle her mother if she got the chance only way to solve was to dry off the milker and put back in kid and said goatling milker now so solved problem, but now the daughter can bullied by the mother. Other time I tried leaving kids on and stripping out if required. A month after everything going well i noticed kid getting hungry so gave it milk then the second kid did the same, but was a nightmare trying to get the 2nd kid to take milk from a bottle. The milker decided she preferred me to hand milk her rather than her kids. I have also experience the milker not wanting to let down her milk or be milked easily by me as she wanted to keep her milk for her kids. Now I just bottle feed everything and milk twice a day so much less hassle for me and I have friendly well trained kids and milkers, stress free weaning and they still have a bond with their mothers who teach the kids grazing Plus I have more milk to divide up instead of milkers drying off to what the kids taking.