Brush your teeth after every meal and snack. Brushing your teeth will actually become a subconscious sort of cue at that point. It will signal to your body that it is done eating. It will also remove the taste of food from your mouth and keep you from snacking.
Don't try to eliminate all the carbohydrates from your diet to stay healthy. Yes, some carbohydrates can cause problems, but they are an essential food group and you need to include them in your diet. Just make sure you are eating the right kind. Focus on eating fruits, vegetables and whole grains.
Joining a gym is an excellent way to lose weight. Being in a community of people who are trying to be healthy will give you inspiration to do the same. You will also have access to an abundance of fitness equipment, so if you get bored with one exercise, you will always find something else to do.