an indian man had told me that fennel seeds would help me loose weight, im not sure how to use themm and if they do work? as well as a normal diet and exercise. anyone tried this or heard that its good at all

Fennel is known for aiding in digestion.
Have you ever been to an Indian restaurant and seen that little bowl of seeds at the exit? Those are anise seeds, which are very similar to fennel seeds. They are to be chewed on after your meal to prevent gas and bloating.
So yes, easier digestion can help a little bit with weight loss. If your body can digest food more easily, then it has more free time to break down other extra stuff. Also, if your digestion is going smoothly, you won't get bloated as often.
There are many ways you can use fennel/anise. You can add the seeds to almost anything... breads, stir fries, even desserts. You can also steep them in hot water for tea. You can also cook with fennel in its bulb form. I have a friend who likes to put it in soup. You can also eat it raw in salads.
Basil and tarragon also contain the substance, anethole, that is also in fennel and anise that aids in digestion. Ginger is another digestive-aiding food, and so is peppermint.