Polyamory

We are an engaged couple. We love each other very much. We have discussed finding another woman to develop a relationship with. This is where the question comes in: where would we look to find this woman? Obviously, bringing another woman into our relationship presents a whole new set of dating dilemmas. We get flustered enough talking to each other while pursuing a monogamous relationship. Where would we look for a woman that is open to polyamory?