Start with the Sermon on the Mount (Matthew 5 - 7).
Then read Luke 6:46-49.
Then spend the rest of your life, using the rest of the Word, coming to grips with what these truths mean to you.
You must first read and know what things you are commanded by Jesus to obey.
Then the challenge is to know how to obey. That is what the rest of the Word is for.
The stumbling stone for most people is getting hung up on WHY to obey...