Is it obligatory for a Muslim youth to inform a non-Muslim of everything Islam entails?

Non-Muslims should not be told all the details of Islam at once. Rather, the caller (to Islam) must start with what is most important, and act with the jurisprudence of priorities, as the Prophet, peace and blessings be upon him, did with Mu'adh ibn Jabal when he sent him to Yemen. The Muslim must invite to Islam with knowledge and insight, and know that inviting to Islam is obligatory, and that they must consider the intellectual level of the invitee, nurturing them with the minor issues of knowledge before the major ones.