My advice would include scripture and prayer, but the one thing that I have not seen mentioned in this thread is history, and what do they teach?
I see people say, go where you feel is right. I am sorry if I misinterpreted others, but that is what I am hearing in this thread. I don't agree with that.
We should be ruled by reason and not feelings. If we pursue feelings, that leads to confusion and also what is known as cognitive dissonance. That is the sense that something is not right, but everyone is so nice to me, that I will ignore it, then the feeling of unease goes away. That is not a good plan. The scriptures say, study to show yourself approved, and also warns that in the last days, people will not endure sound doctrine, but want their ears tickled and get teachers to tell them what they want to hear. If we follow feelings, we will get trapped in that crowd.
Study the history of each denomination and its founder. How did they start and where are they going? Do they teach repentance and holy living, or do they just want to glad hand you and make you feel good theologically, but hit you with conscience when they want ten percent of your income?
There are sincere people that want to study and obey scripture, but for others its just a business. I would say, if you hear anyone preach the prosperity Gospel, run away. Anyone that will live godly in Christ Jesus will suffer persecution. We are not greater than our Master. The world hated Him, it will hate us also.
A good place to start would be the history of America, as I believe that is where you are from. The Catholics were here first, but they were mainly missionaries that wanted to convert the natives, not set up colonies. The original protestants came to Jamestown in 1607 and Plymoth in 1620. They consisted of two factions. The Puritans, that wanted to purify the anglican church, and the pilgrims that did not like the Anglicans because they were too Catholic, so the Pilgrims eventually became congregationalists and the Plymoth Brethren that wanted to be as far from Catholic as possible. It wasn't because they disagreed with all of Catholic teaching, but they rejected the authority of the Pope. The Anglicans still had bishops and the king was the sovereign over the church. Congregationalists wanted complete independence. The problem with that independence is that the Churches were subject to the rules of democracy, which is the opinions of men, rather than an ecclesial authority. We see many of the strong doctrines "watered" down over time from the 1600s till now as each generation claimed to be making progress. Remember the wheat and the tares? Christ said to let the tares remain in the Church, but He never said to have the tares rule the Church. Satan loves democracy. He just sends his tares into a church to vote out sound doctrine, and the salt will lose its savor. Beware of that phenomenon.
We come to Church to learn from and obey God, not to feel good as a primary motive. Once our mind is subjected to truth, God will allow our feelings to follow. That is the peace that passes understanding. For me personally, I searched many different denominations and nondenominational i.e. congregationalist churches, but I never felt at peace. I thought that I knew better than everyone, and each denomination would have one flaw that would eventually become intolerable. Not that I was any better, I was a despicable person. A man most miserable as I convinced myself that I was right and everyone else was wrong, even when I returned to the Catholic Church. It was not until I submitted to the full authority of the Catholic magisterium, and received the sacraments in humility that the sin that so easily beset me was gone. Other congregations could make me feel good, but I was still a sinner, as they told me that I would never stop sinning in this world so don't worry.
That is not good advice. Christ calls all men everywhere to repent, and He will give us the power to do it if we ask Him. I believe that is Revelation 3:20 Message me if you want to talk, but I will pray for you in your journey