As well as orchid mix , with added charcoal as a medium. Orchid food is possible, clueless there but they have slow growing habits that they rarely need to be fertilized.
Are you going to grow the sago indoors? I love sago's and so does the scale, so keep a close eye on it especially if the guy is close to your chids. They are tricky when grown indoors. They like bright light, no sun and a lack of light will limit the growth. One plant I did not have good luck with growing indoors...now outside...whewwww a new chapter...