Hello Happy to know you're interested to learn MSA. There are many professional teachers here on Italki to teach you Arabic as well. Please visit this link: http://www.italki.com/teachers/professional#teach=arabic&speak=english&page=1 Or you go the top menu and click on Professional lesson, then you choose teaches(Arabic) speaks(English) to find every native speaker who speak fluently English and able to teach MSA. Good luck!

Thank you