How can i go from 277lbs to 190?

2 years ago i had an infected gallbladder and of course like most idiots i decided to remove mine i have gained weight since then. I was wondering whether a gallbladder keeps you from losing weight and what can i eat and how can i diet to lose weight should i do a vegetable juice diet for a month than eat fruits and vegetables nuts and seed bread for the rest of my life to maintain a healthy weight, i would say im approximately 5 11 maybe 6 foot 0 in height male 27 years old, i seem to be stuck at 277 i have to admit i have been sitting on the computer and not exercising for quite some time try to help me out please.