Following are very useful books to read for your Hajj Journey.
1. Secrets of the Hajj by Ayatullah Mazaheri
2. Hajj – The Islamic Pilgrimage by Ayatullah Muhammad Zia Abadi
3. Hajj by Ali Shariati
4. Rulings of Hajj by Ayatullah Sayyed Ali Khamenei
5. Rulings of Hajj by Ayatullah Sistani