If you are looking for a great introduction to the Hebrew Bible, John Collins' book, A Short Introduction to the Hebrew Bible, is one of the best around. Concise. Insightful. Easy to read. That about sums it up. The good news is that the book is on Google books, which means that they have posted a large portion of it online for your perusal. You can check it out here. [And I highly recommend that you do...] Enjoy.