First of all, I'd like to warn you that this is my first attempt to create avatars for VR Chat. 
I don't actually play VR Chat myself, and the process of sending avatar models to other people is more difficult than I expected.
For example, I've made a VR Chat account, but I can't upload to my account yet because my rank is not high enough (since I've never played it before).
Please test this avatar and send me your feedback through my Twitter: https://twitter.com/lexferreira89

1- Install Unity, import the Vr Chat SDK and login with your VR Chat Account:
https://docs.vrchat.com/docs/setting-up-the-sdk
2- Inside Unity, AFTER installing the VR Chat SDK, go to "Assets > Import Package > Custom Package..." and select "AmeliaWatsonVR"
3- Still inside Unity, open the scene called "Amelia", click on WatsonAmeliaVRC inside that scene, and on the right-hand-side of the UI, check if:
- there's a component called VRC_Avatar Descriptor (if not, click on "Add Component" button and add it)
- that VRC_Avatar Descriptor has "View Position" settings as X:0, Y:2.45, Z:0.35
- that VRC_Avatar Descriptor has the option "Lip Sync" as "Viseme Blend Shape" and then the "Face Mesh" option is "Body" or "Body (Skinned Mesh Renderer)"
4- Upload the model to your VR Chat account:
https://docs.vrchat.com/docs/creating-your-first-avatar