They will mainly asked about what kind of offers you are interested in, how much experience you have in affiliate marketing, what geos you would prefer to work and the main question how you are planning to promote their offers and what kind of traffic source you will be using?
Just be honest to them, say them you will be using 50onred, media.net etc. or if you want to push traffic to their adult offers you can exoclicks. But keep in mind that they might say that they want a screenshot of those accounts with an active campaign running in them. They might also ask a screenshot of networks you are currently working with and last couple of months of payment proofs. If they are not satisfied they can also ask you to provide the contact info of the affiliate managers you are currently working with. So they have to vouch for you. Be ready and good luck!