need a weight loss plan. any suggestions?

i am looking for people who have been successful in losing more than 50 lbs and knowing how they did it. i need something that is easy to follow and allows substitutions for when i do not have money for "exact" foods. i have been following a high protein low carb plan that allows two fruits but not within 3 hours of bedtime and two whole grain carb servings per day along with vegetables and one dairy serving but it seems like the weight just won't budge. it has taken me almost 4 weeks just to lose 6 lbs,. with the amount of weight i need to lose i need to see a more steady loss. i do walk about 4 days per week 25 minutes per walk and i do some stomach crunches and light weights and leg raises several times per week. i just need good solid ideas that really worked for you.