If you are installing from a netinst CD image and choose not to use a mirror, you will end up with only a very minimal base system.
Ma yella tsebdadeḍ seg tugna n CD netinst yerna tferneḍ ur tseqdaceḍ ara tisit, deg taggara ad d-tafeḍ iman-ik·im s unagraw n taffa adday maḍi.