Can I get the Golden Visa Paperwork in Phuket now that I'm here till mid April?

Does anyone know of an agent or service that can help with the DTV application for self-employment out of Phuket or Koh Samui? I’m feeling a bit nervous about handling it on my own. I just arrived in Thailand and want to make sure I follow the best process. My company is based in the US, but I didn’t have time to apply before leaving, so I’d like to take care of it while I’m here. Any suggestions or advice would be greatly appreciated!

It would be for 2 people applying.

Anyone know where it's possible to extend the thai visa (immigration office) close to Koh Phayam Island?