Depends on how you want to use them. I did a vanilla porter and i split the bean down the middle and put it in the secondary. Most people will soak them in vodka and then add it, in order to sanitize it.
"Yes, I am a pirate two hundred years too late. The cannons don't thunder there's nothin' to plunder,
I'm an [under] forty victim of fate, Arriving too late, arriving too late."