as you are completely new, I would recommend to set up your Stadia Premiere edition with some helpcenter-articles from the Stadia helpcenter. Here are some that might be helpful in the beginning:
If you want to play without your controller on your Huawei, you simply need to install the app and walk there through the setup/creating your Stadia account, etc. As Huawei-devices are currently not supported for Stadia, you might need to enable the experimental mode, check out this article here to show you how.
