Help changing eating habits?

Well I basically eat the same thing everyday, and although it is all healthy food I don't think it is doing me any good. I want to break free from this habit, but I don't know what vitamins I should get from food and what foods have the vitamins. Could somebody help give me some examples/tips on a healthy balanced diet?

I read in an issue of Dancespirit magazine that there are different "methods" to eating (like eating based on ancestry, blood type, or metabolic type), should I try any of these methods?

You don't need to go back to your ancestors or blood type to get a healthy diet.  There are much simpler methods, one of which is the following visual method.  At each meal try to get your plate to look like this....

1/2 plate vegetables/salads, 1/4 plate lean protein (meat, fish, beans, eggs, tofu etc), 1/4 plate complex carbohydrate (wholegrain foods, starchy vegetables, bread),  a little fat (sauce, dressing, cooking oil)

PLUS.... every day have 2 or 3 portions of low-fat dairy products and 2 or 3 portions of fruit.

PLUS.... the occasional sugary food, savoury snack or a glass of wine etc.

If you aim to get a good variety of different foods, lots of different colours of fruit and vegetables, and if you flavour your food with herbs and spices then you will be getting an extremely well-balanced diet that covers all your nutritional needs.  For example.

Breakfast.... A bowl of high-fibre, wholegrain cereal with  milk, a piece of fruit

Lunch... A wholegrain sandwich filled with lean meat, salad, and a little mayonnaise + a low-fat fruit yoghurt, another piece of fruit

Supper....  'Vegetable Chilli' casserole of beans and vegetables with brown rice, salad.  A little ice-cream or other dessert perhaps

Snacks....  nuts, seeds, more fruit, the occasional cereal bar or biscuit.

http://www.healthalternatives2000.com/vitamin s-nutrition-chart.html

This website has a chart of veg/fruits and vitamins for each.  But basic rule of thumb is to eat some of all colors.

yellow/orange- squash, oranges, grapefruit, sweet potato, corn, banana, peppers, carrots, etc.

red- apple, cabbage, peppers, onion, berries,  etc

green- leafy veg's, peppers, brocolli, spinach, apples, celery, etc.

If you include some of each color every day along with your whole grains, protein and dairy you should get your daily requirements.