The guidance that the Bible offers about how to relate to God and other people are relevant today. Today the Bible is available in a number of modern translations. Get hold of a good one such as The New International Version or The Revised English Bible. As the Bible is an ancient book you will need help to understand it. Go to a Christian bookshop and look for Bible reading notes and commentaries.
Notes give guidance in applying the teaching of the Bible to daily life.
Commentaries are more technical and it is best to start with a one volume commentary on the whole of the Bible. Later on it may be helpful to begin to collect commentaries on individual Bible books.