What books do i start with first?

Level 1:

1. Nawaqid Al Islam [The nullifiers of Islam]
2. al Qawaaid al Arba’ah [Four principles]
3. al-Usool ath-Thalaathah wa Adillatuha [Three principles and their evidences]
4. al-Arba'een an-Nawawiyyah [Nawawi’s Forty Hadith]

Level 2:

1. Tuhfatul atfaal [A poem about Tajweed rules]
2. Shurut As-Salat [The Conditions of the Salah]
3. Kitab at-Tawhid [The Book of Monotheism]

The advice of Shaykh Muhammad Aman Ibn Ali Al-Jami ‎رحمه الله was to start in this order (for beginners):

1)‘The Three Principles’

‎2)‘The Pillars of the Prayer and its Obligations and Conditions’

‎3)‘The Four Principles’

‎4)‘The Conditions of La ilāha illā Allāh’

May Allah make it easier for us all.