Read the 4 accounts of the gospel, but afterward read the Bible from front to back. Jesus did not retcon anything, but every book of the Bible is about Him.
Then read the deuterocanon (aka "apocrypha") if you're reading from a Protestant Bible, as it might not be contained in it.
Also, don't rush to read the scriptures… It's not a storybook, or a documentary, or a school lesson you're trying to learn right before a test. It's a book of prayer and religion. Take your time with it. If you're in a hurry for a serious reason, go to church and ask a presbyter to give you a TL;DR (the sermon will be one in a certain way).