Too many questions not enough time.
The Wikipedia artice was a general answer. I quoted it as a general source, I would have happily cut and paste more but found it rather simplistic but that is the nature of trying to provide a general framework for a good question. There are books written on this subject and any number of your good questions and learned replies(not from me) could fill them.
A general framework from just one(me) of half a billion of what Catholics term Protestants:
I am not an inerrantist…which I think makes me like most Catholics on this board. Well why not? The Bible does not support it. Before this sounds too circular…read a little later.
I have spent years reading history and I understand the Catholic stance, I do not agree with it. Well why Brian? Goodness people, have a couple of days?
Let me try and I will not bore you… too much.
As a teenager, a Gideon put a little orange Bible in my hand and I read it. From that I learned, granted from my perspective, what it meant to be a Christian. I did not have too much interference and right away picked out that people described the same situation differently…and I at that time thought…cool…no getting together and coming up with a lie. I was never an inerrantist…but the Bible rang true to me. My kids will describe a movie they saw in different terms but the message of the movie is accurate. As I became an adult, I learned about other ways of interpreting the Bible(name a denomination I could tell you what they think). It did not know to much about Catholicism, never been around it(little did I know that all three of my brothers and most of my friends would be Catholic as an adult). As I got my first history degree, I learned quite a bit about Christian history. I looked at Catholicism because in my view it did not look anything like what I read in that little orange book. Didn’t make sense why it did not. They were around for so long…where did that come from? I found out that most of the Catholic beliefs, in my view, come from tradition. Well that explains it I thought. Nothing wrong with that. More power to them. Studied how we got the Bible. Studied biblical criticism. Read all of Funk, read all of Crossan, read all of Spong, read conservative responses. Saw God working through people, imperfect people, imperfect Councils, imperfect churches. Studied early church history…did not and do not believe in any way, shape, or form the Catholic church(aka in these parts The Church) official position. Just my view…and the other 900 million(or thereabouts) Christians in the world.
Now that is irritating I am sure. I suppose over time I will weigh in on Peter, Mary, the whole nine yards. Specifically the Bible though. God provided what we needed for salvation. Did God work through a Council? Sure looks that way. Did the Bible teach that the Bishop of Rome(wasn’t he in Antioch first…I know the answer) is the universal successor for all of christendom? I did not get that from my studies. Would we have the same 27 books without the Catholic Church? I doubt it. Would Jesus still be the Son of God and the savior of humankind? I sure think so.
Are some of the Orthodox churches wrong for having different books? No way. I could care less. If…and I do not…if I thought that there was a one true church that carried on official Christianity, I am much more historically inclined to think the Orthodox church has a better grasp on things. I am not though. I am an independent Christian…and I cannot imagine anyone would still be reading my tripe.

BrianH
The above is just an opinion and solely the view of me.
Thanks for reading if you did.