Earn a degree in English, writing or language arts. Though prior tutoring experience is not mandatory, have some prior teaching experience, preferably in reading, writing or English as a second language.
Assemble a writing portfolio. Employers often ask for writing samples during an interview for an online writing tutor position. Have your portfolio handy to furnish the writing samples upon request.
Take a methods of tutoring course. Check local colleges in your area to see if they offer such courses. Learning and writing theories are explored, and such courses help prepare you for tutoring writing at all levels.
Apply to colleges offering online writing courses or to online tutoring sites such as Tutor.com. In most cases you can apply online. Forward a resume and college transcript along with writing samples, if necessary.
Participate in a training program. This is generally a program that lasts a few days where you can meet with the writing center staff or program coordinator. You can also discuss assignments and tutoring practices and procedures.