Short answers, pulled from the story.
The Indo-Greek Kingdom was founded when the Graeco-Bactrian king Demetrius I invaded India from Bactria around 200 BC. He is considered the first Greek king to establish rule in the northwestern Indian subcontinent, with coins found in Arachosia and the Kabul Valley marking his advance.
Menander I ruled from his capital at Sakala in the Punjab, which corresponds to present-day Sialkot in Pakistan. He ruled from 165 BC until his death in 130 BC and is considered the most successful of the Indo-Greek kings.
According to the Milinda Panha, a Buddhist philosophical dialogue, Menander I converted to Buddhism and became an arhat whose relics were enshrined in a manner reminiscent of the Buddha. He also introduced a coin reverse showing Athena Alkidemos, meaning Protector of the People, which most of his eastern successors adopted.
The Indo-Greek Kingdom ended as a political entity around 10 AD when the Northern Satrap Saka ruler Rajuvula conquered the kingdom of the last known Indo-Greek kings, Strato II and Strato III, in the Punjab region. Greek populations likely persisted under subsequent rulers for several more centuries.
The first bilingual Indo-Greek coins were struck by the Bactrian kings Pantaleon and Agathocles around 185-170 BC, using both Greek script and the Indian Brahmi script. They also incorporated Indian deities, animals, and Buddhist symbols, making them the earliest known examples of this cultural fusion in coinage.
Craftsmen from Gandhara in the northwest introduced the earliest decorative reliefs at Sanchi Stupa No. 2 around 115 BC, leaving mason's marks in the Kharoshthi script. These have been described as the oldest extensive stupa decoration in existence. Yavana donors also funded construction at Sanchi, with three donatory inscriptions explicitly identifying Greek contributors.