All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His Slave and Messenger.
First of all, we congratulate you for the favor of Islam that Allaah The Almighty has bestowed on you. May Allaah The Almighty reward you the best for your keenness on spreading the message of Islam and may Allaah help you and make you steadfast in adhering to the path of goodness.
There is absolutely no doubt that not all who belong to Islam have sufficient knowledge of the matters of religion; rather, there are some who hold ideas that go against Islam totally as we observe regarding those who are called liberalists. Praise be to Allaah The Almighty Who enlightened you and made you realize their mistakes.
Regarding the matters of religion, it is incumbent upon you to refer to the trustworthy scholars who have deep knowledge about it. Allaah The Almighty Says (what means): {So ask the people of the message if you do not know.} [Quran 16:43]
Generally, it is prohibited to give Fatwa without knowledge for Allaah The Almighty Says (what means): {Say, "My Lord has only forbidden immoralities - what is apparent of them and what is concealed - and sin, and oppression without right, and that you associate with Allaah that for which He has not sent down authority, and that you say about Allaah that which you do not know."} [Quran 7:33]
As for giving some people wrong information about Islam unknowingly, we hope that there will be no blame on you regarding that for you were then a new convert to Islam and you had no bad intention in what you did. Amongst the supplications of the believers stated in the Noble Quran is (what means): {"Our Lord, do not impose blame upon us if we have forgotten or erred.} [Quran 2:286] It was also authentically reported from the Prophet, sallallaahu ‘alayhi wa sallam, that Allaah The Almighty said: "I did (accept your supplication)." [Muslim]
Anyway, it is obligatory upon you to correct such incorrect information which you have told those people. If you cannot do that directly, then there is no harm to do it indirectly and in whatever way that can achieve that aim.
Allaah Knows best.