If I pay for the non-branding option? Do I get to use my domain and emails? I want my clients to see everything as if it comes from my company and n

You can use your custom domain even if you do not upgrade your plan. Here's a guide: https://www.jotform.com/help/144-How-to-use-Custom-Domains-with-Jotform

If you want to remove the JotForm Branding on your form or you want to increase your monthly limits, you can upgrade your account by following this guide: https://www.jotform.com/help/331-How-to-Upgrade-My-Account

Feel free to ask us if you have questions. Thank you.