Asalamu 'alaykum warahmatulaahi wabarakaatuh.
Alhamdulilah wasalaatu wasalaamu 3alaa rasoolillaah amma ba3d
"The books to students in the knowledge of 'aqeedah is to start with
1. Qawaa3idul Arba3
(which is a small concise book regarding the four principles, these four principles are crucial to understand and refute the doubts of the sufis who do shirk and the asharis.)
2. Usool uth Thalaathah
(the second book, it talks about three questions of the grave that will be asked by the angels in the grave. this book is for the students of knowledge as well as the common people because the angels in the grave will ask those three questions every one not students of knowledge only.
3. Kitaab ut Tawheed
(this book is the third book that should be studied in the field of Aqeedah. it is quite a long book, after you have studied this book you will know tawheed properly and you will be able to see the misguidance of the Soofiyyah and the ahlulbid3ah who worship other than Allaah 3azza wajal)
4. Kashfu Shubhaat
(this book is the fourth book, this book is very very crucial for everyone since it destroys the doubts of the Sufis, Sheikhul islaam Muhammad ibn Abdul Wahhaab destroyed the main doubts of the sufis it in this book)
All of these four books are by Sheikhul Islaam Muhammad ibn Abdul Wahhaab rahimahullah.
5. Aqeedah Al Waasitiyyahh( this book is the Fifth book which pertains to the Asmaa ii wasiffaat of Allaah. crucial book)
6 Aqeedah At Tadmuriyyah
7. Aqeedah At Tahaawiyyah
and the rest of the books of the salaf.
The best audio explanations for these books
1. In the Arabic language is the Sharh of Sheikh Saalih ibn AbdulAzeez Ala Sheikh he is from the offspring of Sheikhul Islaam Muhammad ibn Abdul Wahhaab here is the link
(Disclaimer: this website has innovators and salafi scholars together, however this link is good inshaa Allaah)