Am I correct in assuming since you bought an extract kit....it came with dry yeast? If so .....you do NOT do a starter for dry yeast....you can rehydrate an hour or so before pitching....but not necessary.
If the kit came with liquid yeast....then you SHOULD do a starter...and I would start it at least a day ahead of time....better yet 2 days ahead of time....in case it is a slow start....
Let us know what type yeast you have.....
EVERYONE is entitled to my opinion!
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