Probably trading in the best option because it neither involves risk of lossing money nor getting scammed. With just little experience you could make huge profit little by little.
Trading is good for the experienced one. To create bitcoin business we must have computer skill because bitcoin only can be use by electronic stuff such as computer and smartphone. Just create online shop then give customer the option to pay by bitcoin.
this topic is asking about creating a new business. and if you are talking about doing trading then you are off topic here. and if you are talking about creating a new trading platform then we have enough of those, so unless it is in a country that has demand but no exchange service i don't see it becoming successful. but if there are people in your country who are trading bitcoin but in foreign exchanges an exchange service can become successful working with local banks.