As a business it would suck !
Firstly the 'mail order bride' idea doesn't exist. You don't get 'women over' on spec or anything, the money to be made in the selling of contact details between the parties, any immigration actions are up to the individuals. Barriers to entry are virtually nil (internet and someone who can speak English)and ability to extract payment is similarly poor.
Assuming this needs to be a successful business your choice is shitty !
A good idea IMHO in Russia/CIS would be interior decorating supplies or apartment remodelling services. Not sexy I know but EVERYONE'S doing it !
I am marrying a Ukrainian lady in August and NO we met the old fashioned way, in a pub !
" Help, help ... I'm being oppressed ... "