Hey Leigh,
"Pregnancy Bible" is used here as a source of information, but you can read more or less the same in all other book as well. In Pregnancy Bilble I like the amount of details - there are about 14 pages only about eating .... So,
per day:
6-7 portions of carbohydrates - unrefined cerials, hwolewheat breads, whole wheat pasta, grains, potatos etc. (a portion is about 140 gramm of potatoes (5oz) or 2 slices of bread);
5-6 portions of fresh fruits and vegetables, preferably raw or steamed instead of boiled (a portion - a glass of orange juice, big piece of fruit or 3 tbs of cooked veggie)
dairy - 3 portions - (portion - 40 g cheese or 140 gr yougurt)
2-3 portions of proteins - meats etc (portion - 85 gr meat or 115 gr fish)
1-2 portions of fats, oils and sugars
To avoid:
- fast-foods, sodas and generally to decrease sweets - "empty" calories without nutrients.
-
raw or undercooked meat, fish, shellfish, eggs (inlcuding such things like real tiramisu

, sushi, steak tartare, home-made mayo etc.)
- all unpasteurized cheeses - brie, camembert, stilton etc.
- underheated precooked-chilled meals
- unpasteurised honey
But in the first trimester it also sometimes depends on what you body allows you to eat! My, for example, tolerated only small amount of pasta with farmer's cheese, plain yougurts, rice cereals and some fruits. I've threw out even minestrone soup!!!