Defined an Interactive Avatar but can't load it

I have defined an interactive avatar but I can't load anything other than default

sessionData = await avatar.createStartAvatar({
    quality: AvatarQuality.High,
    avatarName: "default",
    disableIdleTimeout: true,
    language: "en",  // Use correct language code
  });

Also in order to get user voice input, how can I do STT on it before talking to my own LLM?