I use a paint stirrer similar to this one
https://www.google.com.au/search?q=paint+stirrer&biw=1366&bih=681&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwir89n7xbrNAhVLEpQKHYaMCbAQ7AkIOA&dpr=1#imgrc=KWIOacCgifFvWM%3A
I use the stirrer to add oxygen to the brew , vigorously , then add yeast and...