I want to know which kind of e-business will get Magento's help, can it be a site like wholesaleclothes.net or must be a shop on eBay and amazon？
Magento provides the basic functionality of e-commerce system
But if you want to make like marketplace like Amazon then you need to buy some add-on for that.
Magento provide any type of customization into the system
check above link, it is magento demo.
hope it will help you.
Welcome to the forums!
Can you explain a little bit more which kind of help you expect from Magento?