Hey Li,
Thanks for posting the question. The heading structure usually go something like this,
<``h1``>Main Headingh1>` `<h2>Secondary Heading 1`h2> <h3>Sub-section of the secondary heading 1`h3``>````
``In your case, I'd suggest you to go with your main "Service/Product Name" with your brand name at the page title (it's a common practice) And in H1, you can use your main service/product name.
The heading tags are used to represent different sections of web page content and they have the impact on both the SEO and usability of your site. So do use them where they should be placed and do not stuff them with the keywords.
Hope this helps!``