I’ve previously written a tutorial one what one specifically needs to do to add an OTS chapter onto the website, here
You can see what a Pull Request of what doing that looks like here (hope to merge that in soon). The page is likely best written by the organisers of that chapter! If you’re not familiar with git or Github then we can either help teach you or help find someone around your area who can help 
There’s no formal sponsorship precedent as far as I’m aware, I’ve seen Github sponsor other things for git related events (no surprise!), but as far as I know we are not against such things as long as the sponsorship would be inline with our core values. Of course informally a lot of tech businesses have helped out our meetings by providing spaces for various chapters around the world; Google provides us an non-profit/educational account for their Apps.