he is meditating
He is a boy in Nepal who has spent many hours meditating. Some people think he's a very enlightened being, and others think he's a fake. I bet the same was thought of the Buddha. Likewise, there are lots of fakes out there.
Siddhartha Gautama renounced his life of luxury, including his princely status, wealth, and family, in search of spiritual enlightenment and to seek a solution to the suffering in the world. He was motivated by a deep desire to understand the nature of human existence and find a path to alleviate suffering for himself and others.
By meditating & giving offerings to images of the Buddha & other Buddhist deities.
While I cannot give you a sutra, I can comment on the question. When Buddha says he was a buddha before he started meditating, what he means is his buddha-nature exists here and now. However, before he became enlightened, he had forgotten it. He was not aware of it. The mind created a fog, so that he could not see his buddha-nature. Meditation is the process of clearing the fog, so that you may remember (become conscious of) that which already is.
Briefly: By leaving home, meditating, practicing the Middle Way and the Noble Eightfold Path.
The Buddha became enlightened meditating under the bodhi tree in Bodh Gaya, India.
he was a man
Buddha is not a country.
By practicing the teachings of the Buddha diligently all the time. By meditating and being mindful of our thoughts, words and deeds.
An Indian prince.
Buddha focused on helping humanity & meditating in jungles. Buddhism did not teach people how to live normal life & do Dharma (righteous living).