I am a first year medical student studying in nepal.I want free training course in first aid in foreign country with the provider bearing all kind of expense including airfare,fooding,lodging etc.

You're a first year student? This is not going to happen. Im not sure that a not-for-profit corporation has any need for your talents. If they do it is not unusual for YOU to pay the expenses.

What would be your value to the entity teaching you first aid for free?

Wow, I would love that also,

A first year med student, only wanting a week training in first aid, what would that be CPR, wraping a few cuts?
And you want air fare all paid,

Ok, so you want a free week vacation somewhere huh ?

That is not going to happen, get over it.