Creating multple paragrahs in Microsoft 365 Word docs

Hi

I want try out creating a word document in say an Azure function. 

Looking at the docs:

https://docs.microsoft.com/en-us/office/open-xml/how-to-open-and-add-text-to-a-word-processing-document

It seems that the number of paragraphs I want to add must match the <w:t> elements in WordProcessingML template .

<w:document xmlns:w="https://schemas.openxmlformats.org/wordprocessingml/2006/main"><w:body><w:p><w:r><w:t>Example text.</w:t></w:r></w:p></w:body></w:document>

1. Has anybody done this recently with the latest versions of Word - was it stable?
2. Are there any examples of the templates anywhere?
3. Is there limit to amount of text per paragraph?
4. Is the way to add headings prior to each paragraph?

Collaboration Solutions Architect