If suppliers of the company are all foreigners, what should be the objectives for a better foreign exchange risk management?

As we are a group of companies, we are dealing with several suppliers in different countries, so far as we are not facing any problems. All our transactions are doing from our bank automatically to any currency. No any problem yet you can do it simply.  

Maintaining a optimal hedging policy by use of instruments like Forwards/Options/swaps would help mitigate risk arising out of FX volatility. Always hedge your positions in Fx and worry about your business rather than Fx volatility. 

if the settlement date is any future date, the future options will help to secure from any adverse movement in FX.

Well, in addition to above answer...

Planning to improve lead time in payment processing and shipment or deliveries are essential factors.