Not that the question was directed to me, but the intro to the following article might be a useful reminder of how things were done in the olden days...
The Buddhist Missionaries - By Ven. Dr. Rewata Dhamma, 1985
"Go Ye, O Bhikkhus, and wander forth for the gain of the many, for the welfare of the many, in compassion for the world, for the good, for the gain, for the welfare of gods and men. Proclaim, O Bhikkhus, the Doctrine glorious, preach ye a life of holiness, perfect and pure."
This saying of the Buddha fully contained the missionary spirit. He further said:
"O Bhikkhus, don't go together two in one direction"; and because of this encouragement his disciples travelled in different directions wandering from village to village, country to country.
Two and a half centuries after the passing away of the Buddha, according to the tradition preserved in the Sri Lankan chronicles, the emperor Asoka (third century B.C.) organised a net-work of missionaries to preach the teachings of the Buddha outside India. At that time his son and daughter went to Sri Lanka to teach the Buddha-Dhamma. Also two monks named Sona and Uttara were sent to Suwanabhumi (Burma) to spread the Teachings. According to this tradition Buddhist missionaries went abroad from the third century B.C.
Buddhism was introduced to central Asia 234 years after the passing of the Buddha into Nibbana, i.e. in 240 B.C. China received Buddhism for the first time in the first century BC and within a century it was officially recognized as a religion by the state. Buddhist monks began going to China from the end of the first century B.C., and Buddhism arrived in Korea and in Japan in the fourth century A.D. and in the sixth century A.D. respectively. Tibet received the Teachings of Buddhism in the seventh century while the Buddha-Dhamma has flourished in Thailand from the first or second century A.D.
According to Chinese chronicles and archeological findings, Cambodia became a Buddhist country from the end of the fifth century A.D. A large number of inscriptions discovered in different parts of Malaysia are written in Sanskrit show that Buddhism was already flourishing in this part of Asia at this time.
From this it can be seen that these Buddhist monks travelled to many strange countries without any financial support, facing many hardships during their journeys. They did not know anything about the countries where they were going and relied only on a strong confidence in the teachings of the Buddha.
There were many religions born in India; but only Buddhism was flourishing all over Asia within a few centuries.