you when you stick your hand in the sink, it will kill the yeast. you’re aiming for a temperature between 95-110 for most yeast; that’s about the temperature of the water in your typical hot tub. you have to get the water all the way up to 130-140 before it kills the yeast. you may feel safest using a thermometer the first few times and then just going by touch after that.
a very bubbly sugar, yeast, and milk powder mixture proofing in warm water.
you can then add your flour, salt, and any extras to your yeast mixture. an important note on salt: most bakers agree that salt actually slows down 