We're excited to see what you've got in mind! VRChat is full of amazing things that users (like you!) have created and are sharing with the world.
The best place to see information about the VRChat SDK is at our documentation page. You can view it here:
Unfortunately, VRChat Support is unable to assist with things like "How do I make a world?" or "How do I fix my avatar's rigging?" For issues like that, please check out these Community-created resources: