Documentation and sales page content

Hello,

What do we search?
We search for high quality sales content and documentation content writer. In general have basic content already which must be changed, expanded or corrected.

What it content about?
We are sport betting platform providers. We sell our own created platform. We want to create professional promotion content for documentation and promotion pages.

What do we require?
Please check websites below:

betscheme[dot].com - promotion sales page
docs.betscheme[dot].com - documentation page

We give full freedom to change the website content.
We need extend the content.

Questions below:

1. Do you have specific experience in documentation or promotion sales content writing? If yes can you shows some websites you worked on?
2. Can we agree on specific amount for this task?