In the Buddha’s Words: An Anthology of Discourses from the Pali Canon has long been the best way to begin reading the suttas. You can read a short book review here that explains why.
This e-book contains the main introduction as well as the introduction to each of the ten chapters. While no substitute for reading the book with the actual suttas, this can give you a good idea of the book’s contents as well as Bhikkhu Bodhi’s writing style. If you would like to start exploring the suttas included in this book now, you can use this on-line guide that links to SuttaCentral.org’s translations of the same suttas.
You can buy the complete book from Wisdom Publications as a print or electronic edition. It is also available from on-line and regular bookshops.
These selections have been made available for non-commercial distribution by Wisdom Publications.