You can read about the different schools of Buddhism here: http://en.wikipedia.org/wiki/Schools_of_Buddhism
Buddhism. There are many different sects.
If you are referring to Sects, there are numerous sects in Buddhism. Probably the most famous are Mahayana, Theravada, and Zen.
Not all sects of Buddhism practice vegetarianism.
Some of the SECTS of Buddhism are Theravada, Mahayana, Tibetan, and Zen Buddhism. Buddhism is a religion, and therefor it has no "religions".
The are many schools of Buddhism and many sects in each school. many have monastic groups
Many Buddhists don't consider Buddhism to be a religion, but a philosophy. There are many different sects within Buddhism, like Mahayana or Zen, which use different techniques to understand the true nature of reality, and interpret the teachings given by the Buddha somewhat differently. Most of those sects believe that the other sects are all valid interpretations of Dharma, though there are some who think theirs is the only way.
sects are religious or political groups. Alida is a central figure in the "Pure Land" sects of Buddhism.
Buddhism has many sects and schools and so there is no single religious leader. Much as the pope may be regarded as a Christian leader, he is not the leader of all Christians.
Theravada,Mahayana, and Mantrayana
Yes, an accepted canon of sutras in Buddhism is the Mahayana sutra.
You can read about the different schools of Buddhism here: http://en.wikipedia.org/wiki/Schools_of_Buddhism
One example of a religion that does not have a central deity is Buddhism. Buddhism focuses on teachings to guide individuals towards enlightenment and self-realization, rather than worship of a god or gods.