@ari05
I would start by getting AP. Then make accounts on pornhub, xhamster, and xvideo. Those are the 3 main sites I see people posting IMVU porn on. Message some of the other accounts that are uploading videos; ask them if they'd be interested in letting you be in their videos.
If you can't find someone to work with; you might need to learn how to do your own video editing. If you learn your own video editing, then maybe you can be the one hiring actors.