Kali Linux: Installation Problem

Hi to everyone! I've got problems when I get to the "Configure the package manager" phase where it is asking about the network mirror. I always get the "Bad archive mirror" error. I am installing from a live usb. I know I can continue without a network mirror. But my kali will have only a very minimal base system. I don't know what to add to kali (through a terminal) after completing the installation. What are the things I should add to kali or update or should do after completing the installation?