Missing Books?

The Bible. Is it complete? Do we know all of what we were supposed to know. The Bible wasnt put together Old and New Testament until around the 3rd century. There wasnt Holy Men inspired by God that put it together either. It was put together by regular men. They decided what should go in and what should be left out. Who's to decide that but God? What if they left out some of the most important books for our salvation? Do you know what these men did with the books that they didnt use? They burnt them and sold them. The Bible we have now I believe to be the work of God, but it was put together by regular ole men and has been edited by several people. Did you know that King James took things out of the Bible just because he didnt like them. We can never get that back. What are we supposed to do. I think we have enough to know what needs to be done to get to Heaven. But still, who were they to do what they did with the Bible. If I dont like a verse I cant just white it out and it not apply to me anymore. It doesnt work like that. So what if those lost books have important knowledge that we as Christians need? You tell me cause I dont know.