Casting for our Opening credits project

We decided it would be best to get someone else to star in our project to allow our group to focus more on the technical side of the film. We have a few ideas about who we could choose but have yet to approach these possible candidates. Some of the people are from the performing arts class that some from our group knows, yet some we are considering our from our media class who will probably be easier to get. We want someone who has acted before so they have experience and doesn't make it seem like a forced performance which is different from our preliminary project where we didn't mid who was in it.