Question

How can we make a poster or collage of ancient India contact with distant lands

Answer 1

you can make a poster by showing people doing business with ancient India. making a collage will be much easier you can paste some pictures showing people doing business or Chinese travelers sitting in courts of Indian kings or takshila university etc you can also paste various writings from ancient book mentioning India's contact with distant land.
above pictures is one of the example.

Answer 2

India has a long history of interaction with other countries through trade, migration, religion and conquest. ... The spread of Buddhism from India to Central Asia, East Asia and South-East Asia. ... Southern India that benefited from expanded economic and cultural contacts with West Asia ...