This letter is from `Abdul `Aziz Bin `Abdullah Ibn Baz to the honorable brother, Mr. A. Z. (may Allah guide him to all goodness, Amen).
Assalamu `alaykum warahmatullah wabarakatuh (May Allah's Peace, Mercy, and Blessings be upon you!)
I received your letter in which you inquire about the True `Aqidah (creed). Let me tell you that the True `Aqidah is embedded in the Qur'an and Sunnah (whatever is reported from the Prophet, peace be upon him). Therefore, I advise you to recite and memorize as much as you can from the Qur'an and to memorize some of the Hadith Sahih (authentic Hadith) such as "AlArba`in AlNawawiyyah (The Forty Nawawy Hadith)" with the additions of Ibn Rajab and "`Umdat AlHadith" by AlHafizh `AbdulGhany ibn `AbdulWahid AlMaqdisi. Try to read a lot in the Two Sahih (authentic) Books of Hadith (i.e. AlBukhari and Muslim) whether by yourself or with the aid of righteous Muslims.
In addition, read the books of Sheikh AlIslam Ibn Taymiyyah such as "Al`Aqidah AlWasitiyyah", "AlHamawiyyah" and "AlTadmuriyyah". In them, Sheikh AlIslam (may Allah be merciful with him) explained the `Aqidah of AhlulSunnah walJama`ah (those adhering to the Sunnah and the Muslim main body) and refuted the allegations of their enemies. I also think it would be useful to read "Kitab AlTawhid (The Book of Monotheism)" by Sheikh Muhammad Ibn `AbdulWahhab (may Allah be merciful with him) and his "Kashf AlShubuhat (Removal of Doubts". Both are very useful books.
Above all, I advise you to supplicate to Allah and ask Him to guide you to His Right Path, to grant you understanding of His Way and to grant you Refuge from the evil whispers of Satan and from callers to falsehood.
Moreover, try to ask Allah to open you heart to goodness and to aid you to recite the Qur'an often, memorize it and memorize many Hadith. Allah (Glorified be He) states:
Invoke Me, [i.e. believe in My Oneness (Islâmic Monotheism) and ask Me for anything] I will respond to your (invocation).
Obey Allah and beware of committing sins! It is related that AlShafi` (may Allah be merciful with him) once said:
I complained to Waki` that I cannot memorize well so he advised me to abstain from sinning He said: Know that knowledge is light and Allah's Light can never be granted to a sinner
I ask Allah to correct our intentions and deeds, for He is the Best One to be asked!
Finally, I would like to advise you to join the Islamic University of Madinah, for it adheres to Salafiyyah teachings (those following the way of the righteous predecessors) and teaches its students the `Aqidah of AhlulSunnah walJama`ah. May Allah ease things for you and guide us all to beneficial knowledge and following it, for He is AllHearing and Responsive. Peace be upon you!