Hi Myname! The first week you'll want the temperature 90-95 degrees. (I keep it at 95* for my silkies the first week.) Then, you lower the temperature by about 5 degrees each week untill the are feathered. Make sure it is warmed in certain areas of the brooder (under the light) and cooler in other areas so they can move themselves around to find a comfortable temperature.
-You might want to start with a 75 watt bulb and just lower the clamp until your thermometer temperature says 90. In the following weeks you can raise up the light and also put a lower wattage bulb in place to get the desired temperature.
-Some people don't use a thermometer, but just watch the chicks to see if they are huddled (meaning they're cold) or spread out panting (meaning they are too hot.)
I have an interesting situation in my brooder, right now. I have (4) 2 & 1/2 week old silkies in there and I just added (2) week old silkies last Friday. I was worried that the babies would need their own brooder because of the different temperature need. But no, all the chicks sort of spread themselves out in the spot that feels "just right" to them. Sometimes one of my nurturing "older chicks" will even go lay next to one of the babies who are usually closer to the light. Hope you enjoy your babies.