Thank you for your question. One book I found really useful and inspiring when I started studying is A commentary on 40 hadith by Ayatullah Khumayni (r), and I still revisit that book and even teach from it now.
I would also recommend going through The Scale of Wisdom to get an idea of what the scriptural sources say on a variety of topics. InshaAllah I will be launching a podcast covering the book with a short commentary in the near future. To find the podcast just search my name or The Scale of Wisdom in any of the regular podcast platforms (such as Apple podcasts, Google podcasts, Spotify etc)
May you always be successful.