Find a PPO Dentist.
One of the biggest benefits to having a PPO dental plan is that you can either choose a dentist in the plan network of providers or go to your own dentist provider or not. However if you do not currently have a dentist choosing a provider in the network is normally a better idea since you reduce your risk of having any UCR fees.
How you go about finding a dentist can come from many sourcing. One referrals from a friend is normally a good starting point. You can also call your dental insurance provider and find out what dentist are a provider of their plan. They should be able to help you with that right over the phone or at least provide a website with their provider list.