You will have the option to Follow and Support the page. When you support the page you receive a special Supporter Badge and access to the channel stickers. These will only be available on your profile and not any pages you make, so keep that in mind. That being said, the other option to hide your personal identity is to make a Gaming Page.

To support from Desktop, you just need to go to the Overview tab next to the Live Comments tab. From Mobile there is an icon next to the chat you will be able to click,

The only way to Gift Subscriptions is on mobile, to do so you click the same button you did to Support the page and it will allow you to gift up to 50 Subscriptions.