I suggest starting Musar Movement 2.01. [Musar means books of Ethics of certain sages of the Middle Ages.] That is a second version of what Reb Israel Salanter had started. Even though in many Litvak Yeshivas, Musar is learned in two short sessions, I feel they are too short and also do not take into account the world view issues that those same sages had written on.
For example one well known Musar book is the שמנה פרקים of the Rambam on Pirkei Avot. But for some reason his Guide for the Perplexed and the Musar books of his son and grandchildren are not learned--and not considered a part of Musar.
But I am not thinking about what books people want to learn as the big issue. The big issue is this: the original Musar yeshivas were really into it. They really spent a great deal of time and effort on correcting their traits and coming to Fear of God. It was (24/7) 24 hour seven days a week project.
[I do not have an opinion about the different schools of thought however. They all seem worthy of respect. However I had a particular like for the Musar approach of Navardok which emphasizes trust in God. Maybe the reason is that that is one area I am deficient in. ]
But even the very short time I was involved in learning Musar I must say it gave me encouragement in great directions. Correcting my own traits, getting to Israel, personal prayer, speaking the truth. I must say the amount that I gained from it in that short time was immeasurable.
[I mean to say it gave me motivation to not make excuses. Thus when I saw the commandment to get to Israel I took it seriously. "Israel or Bust" was the idea. ]
Musar also has a close connection with Rav Joseph Karo. The best way to learn Rav Karo's books on law I have generally found to be to learn the actual Gemara that the law is based on. Without that it is hard to get any clear idea of what he is saying.
A good example comes up in חושן משפט [circa 155] where Rav Karo goes with the opinion of the Ri MiGash and the Rambam and Ramban that placing something that can cause damage to a neighbor's wall can put put on the borer before there is a wall. But still this does not apply to היזק ריאה In terms of opening a window into a "חורבה" empty broken down building because of "maybe you will fight with me in court" . To see why both decisions are right you need to see the Gemara and Rav Shakh's Avi Ezri. Rav Shakh says that maybe you will fight with me in court is a good plea and a good reason to stop the fellow from opening a window because היזק ראיה already has a category of being a מזיק. But things that you can put next to a boundary when there is no wall do not have a category of being causes of damage until there is a wall built. Rav Shakh is saying that is the opinion of Rav Joseph Karo-. He suggest that Rav Karo derived this from the Ramban [M. Ben Nahman].
From that it looks like that to Rav Karo there would be חזקה for היזק ראיה. This actually came up once in my experience when one neighbor asked another to put up a wall even though the area had been open for years. . But I guess that the expenses would be shared in that case.
But in any case without learning the Gemara, I think it is impossible to understand what is going on there.[Rav Shakh answers that היזק ראיה is already a היזק before the place is rebuilt.]