Hi Luis,
If you are starting fresh : some points to work on:
1) Get your business lined up and ensure you have source for business before you start
2) The initial cost of setting up a call center is rather high if you purchase the dialler and software. You may want to consider setting up using a Hosted Virtual solution and using VoIP , it will save you a lot of money initially. And your running costs could be as low as $1 per hour .