I would check with your Customs Laws and the Local Law enforcement to find out. If it it legal, You can check out Airsplat.com. They ship internationally all the time. Check em out.
http://www.airsplat.com/
yes airsoft guns are legal in OHIO
Yes, airsoft guns are legal in Canada.
Usually airsoft guns aren't allowed in public places
Yes, they are.
Yes
Yes they are.
Yes
Yes
Yes, i'm 14 and i own 4 airsoft guns.. As long as its on your property and not like in a city
18 in the USA
I don't know about Canadian airsoft stores, but I know that most airsoft in North America sell Canadian-legal airsoft guns.
You will have to check the law in India regarding Airsoft guns. Until you are 100% sure they are legal, do not bring them to India.