You can just pour in your yeast and call it good, assuming you've aerated the wort.
I usually make starters a couple of days ahead to give the yeast a few days to reproduce.
I think some use shorter times, but the charts I've seen suggest yeast reproduction goes on for a couple days.
I don't worry about the temp of my starters, I leave them on the counter.
The yeast store oxygen for reproduction, which is what goes in in the starter and right after you pitch it. Once reproduction starts it doesn't take up new oxygen it has to live off what it has. So while you are growing the population you want oxygen. You don't want oxygen after that growth phase.
Then when the actual fermentation starts and any excess oxygen will be pushed out of the beer. You don't want to reintroduce oxygen once this happens.
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Dave in Madison
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