I usually charge from $3-&5 per 500 word article depending on the topic needed. You did not stipulate if the articles would center around a specific theme but I have written articles that include pieces on agriculture,socio-cultural practices, diet, infant formula, vitamins, how-to's, arts and crafts, and the like. As a mother, my time is also very flexible & you can depend on me. Incidentally, English is my first language.