I was an active protestant before joining the LDS church 40 years ago. I have a grandfather and uncle who were protestant ministers. I can tell you that the LDS church is nothing like any other church. The entire premise is different in the following ways:
1. The church is led by revelation to living apostles. It has a hierarchical leadership organization with unpaid positions at every level. There is no paid ministry and most adult members are called to positions of service. For example, the church has about 80 thousand full time missionaries who pay their own way. Service in the church and obedience to God are a kind of joyful sacrifice that leads to great faith.
2. The Holy Ghost is of huge importance in the church and members receive the gift of the Holy Ghost at baptism. Through companionship of the Holy Ghost, members come to know with certainty that God lives. The Holy Ghost leads faithful members to all truth throughout their lives. In addition, members receive spiritual power to overcome weaknesses and become like God over time through the saving ordinances of the gospel. This is a very real influence.
3. Members of the church study the bible and other scriptures but the foundation of the church is not the bible. The church is "built upon the foundation of the apostles and prophets, Jesus Christ himself being the chief corner stone". Ephesians 4:20
4. Members are under covenant through the preparatory ordinance of baptism to take upon them the name of Jesus Christ, repent, strive to keep his commandments and to serve one another. Faithful members are endowed with faith that leads us to follow Christ. Unshakable faith is a gift of the spirit.
I cannot begin to explain all the differences but I can tell you that the most important thing I have in this life is the knowledge I have through the spirit that God lives and still works among his children today. This knowledge does not come from intellectual arguments from the bible but comes through the Holy Ghost. Everything that comes from God is good and everything the church produces is good and right and true.
If you want a spiritual experience, study the Book of Mormon in sincerity of heart and a real desire to know if it is true. Forget about rumors of Joseph Smith and writing styles. Just find out what it has to say. Here it is online for free. It includes a promise in the last chapter that you can know it is true through the power of the Holy Ghost.
https://www.lds.org/scriptures/bofm?lang=eng