I should mention that in my first yeshiva [Shar Yashuv in Far Rockaway. Reb Shelomo Friefeld's place.] they did not believe in orientation at all. They threw me into the raging sea of Gemara, Rashi, and Tosphot, [Talmud] the second I walked in the door. Sink or swim. And I tend to agree with this later approach. But I have come to see that some people are working or in university, and so need some kind of orientation.
And at some point myself felt some need for Musar. My first yeshiva did not learn Musar [Ethics] at all. That was a good degree of my motivation for going to the Mirrer Yeshiva which is a Musar yeshiva.
The Guide for the Perplexed by Maimonides was written for this express purpose of orientation for people and so was the book by Saadia Geon, the Emunot VeDeot, but I found them both to be difficult. But both are written by the greatest sages since the time of the Talmud, so both are worthwhile looking at.
I would recommend avoiding books written by cults that tend to be mental traps. And you don't need me to explain to you what a cult is. You can tell at one glance. Mainly they will present themselves as teaching some mysticism.There are groups who have insane doctrines that are not Torah but try to convince others that they are legitimate. I can't even begin to describe how damaging these groups are. And I recommend doing everything possible to stay as far away from them as from a ticking time bomb. Even more so, I would like to see them disappear because of the damage they cause to the unsuspecting.