If you want a set visit, you need to find someone who is working on the set or someone who knows someone who is working on a set.
If you want a pitch meeting, those are harder to get. It doesn't sound like you're represented or you wouldn't be asking me about this. Do you know someone who believes in your project pitch enough to get you in the door?
These are the most simplified answers I can give you in a blog with the little information you gave me.
For more tips and articles by top entertainment industry career coach, The Greenlight Coach, visit www.TheGreenlightCoachBlog.com