You can sign up at the right brain education shop and see how it goes. They told me one can cancel their membership within 30 days if they don't like it.
There is a very good blog by Shen Li about right brain education
http://www.figur8.net/articles/right-brain-education/If you want to do RB flashing per Shichida, I believe, he recommends at least 200 cards/images at a time. We also do TW and WInk to Learn Spanish with my 2.5 y.o. It doesn't seem like it's enough flashing according to Shichida. There are other aspects of RB training apart from flashing. Shen Li's blog will help you with that. Good Luck!