i want to start on a diet, do you know anything that could help me ?
Well the word diet implies the use of certain intake of nutrition for health or weight management. Which are you aiming for?
weight management 
Dietary habits and choices play a significant role in quality of life and health. It will be more of a lifestyle change to lose weight.
i can see that, what else can you tell me
A lot of people go with vegetarianism. Buddhists usually are but depends on their sect. Would you consider it? They are said to be one of the healthiest groups  
yea i would consider it.. sounds like i should look into it more
meat-eating may be permitted depending on the sects. In Hinduism, vegetarianism is the ideal. Jains are strictly vegetarian and consumption of roots is not permitted.
Dietary choices.
Many people choose to forgo food from animal sources to varying degrees (e.g. flexitarianism, pescetarianism, vegetarianism, veganism) for health reasons, issues surrounding morality, or to reduce their personal impact on the environment, although some of the public assumptions about which diets have lower impacts are known to be incorrect. Raw foodism is another contemporary trend
Diet (nutrition)
In nutrition, diet is the sum of food consumed by a person or other organism.
The word diet often implies the use of specific intake of nutrition for health or weight-management reasons (with the two often being related). Although humans are omnivores, each culture and each person holds some food preferences or some food taboos. This may be due to personal tastes or ethical reasons. Individual dietary choices may be more or less healthy.
Complete nutrition requires ingestion and absorption of vitamins