It's a week old, right? You could have it on 4 bottles a day now, I would think, unless it's no trouble to you to feed five times.
It needs some sort of forage - hay, straw, grass - available now, also fresh water. It may not take much water as it's getting plenty of fluid in its milk, but have it available as it will start to need the water as it starts to eat hay and/or creep.
Creep-wise, it'll probably not start eating creep yet, especially with no mum or other orphans to copy, but you could start putting a few pellets down now and again from about 10 days onwards, see if it bothers with them. Don't leave stale pellets down, better to remove them after 12 hours and try again in a day or two. They often don't really bother with the creep until 3 weeks or older, and even then may not take them until you make them hungry, either by reducing the quantity of milk or cutting the number of feeds.
There's no hard and fast rule about creep, but you want it eating at least 1/2lb a day before you take it off milk completely. The earliest you would be thinking about doing that is 5 weeks and only then if it's really tucking into its creep and eating plenty of hay / grass.