After JALLIANWALA BAGH, if you want to visit Wagah border, you will have to take personal taxi, shared auto and bus . Personal taxi will charge you more, but sharing will save your money a bit. You will just have to pay 120 rs for up and down including toll charges. It will take you approx 2-3 hour to completely explore that place. Security checking is tight. You will have to go through 2-3 checkpoints and after that you can go to that area from where you will see the famous Beating Retreat ceremony. True patriotic place, all chanting vande matram, Jai Hind , Bharat mata ke Jay will fill your mind and body with complete patriotism. The ceremony starts with parade from soldier from both sides and ends with lowering of national flags. As the ceremony ends, you are supposed to leave the place. It will take you approx 30 min to 1 hour to reach Amritsar city.
Some pictures from wagah border.