Hi Birgit. My name is Chris. You say you don't know very much about Buddhism. Well the fact of the matter is that you should get one of the Nikayas translated by Bhikku Boddhi
The second category is the Sutta Pitaka (literally "basket of threads", or of "the well spoken"; Sanskrit: Sutra Pitaka, following the former meaning) which consists primarily of accounts of the Buddha's teachings. The Sutta Pitaka has five subdivisions, or nikayas:
Digha Nikaya (dīghanikāya) 34 long discourses. Joy Manné argues that this book was particularly intended to make converts, with its high proportion of debates and devotional material.
Majjhima Nikaya 152 medium-length discourses. Manné argues that this book was particularly intended to give a solid grounding in the teaching to converts, with a high proportion of sermons and consultations.
Samyutta Nikaya (saṃyutta-) Thousands of short discourses in fifty-odd groups by subject, person etc. Bhikkhu Bodhi, in his translation, says this nikaya has the most detailed explanations of doctrine.
Anguttara Nikaya (aṅguttara-) Thousands of short discourses arranged numerically from ones to elevens. It contains more elementary teaching for ordinary people than the preceding three.
Khuddaka Nikaya A miscellaneous collection of works in prose or verse.