Learning to homebrew
But, do you need to stir your yeast in once you've pitched it?
Stirring can cause the yeast to clump more and stick to the inside of the fermenter, away from your wort completely.
To aerate the wort properly, be sure to stir it BEFORE you pitch the yeast.
Use a yeast starter to introduce more yeast cells into your wort that are healthier and will mix more easily!