Part of Inviting to Allâh is the Distribution of Beneficial Islamic Cassettes
Question :
Despite my young age, I wish to be a Daa'iyah; however, I don 't have suitable skills to do so. Is it enough for me to distribute Islamic books and audio cassettes?
Answer:
Yes, it may happen that someone is not able to call others by himself, but is able to call by distributing good Islamic books and tapes. But based on the assumption that he is not himself qualified for such Da'wah, he should not distribute these books or cassettes until he has presented them to a student of knowledge in order to learn of any errors they may contain. In this way he will not be unknowingly distributing harmful material.
Another way for one who is unable to call others, is that he can financially underwrite a project wherein a student of knowledge writes something inviting others to do good.
Source:
Ibn 'Uthaimin
Fatawa Islamiyah, Vol. 8 Pages 61-62