Profitability: it varies, between 5-10% per trade.
Investment required: Not only looking for investors, if someone can't invest money might be interested in supporting operations, etc.
rough details of the business operation: Buying BTC where is cheaper, selling it in countries where it's more expensive.
You realize that this is not really a unique idea? You're just describing arbitrage. Plenty of people do that, plenty of businesses do that, it's risky and you can't guarantee that you'll always be able to pull it off. Surely you cannot actually think that you're the first person who has ever thought of buying BTC on one market/in one country and selling it on another market/in another country?
What gives you an advantage doing that over others? There is plenty of software which attempts to take advantage of these margins - have you developed any yourself? I am guessing that your answer will be a no.