Congratulations on your pregnancy!!! Here's my advice:
The first eight weeks of pregnancy are the most critical as far as nutrition goes---all the baby's vital organs and systems are forming. After the first eight weeks, it is all maturation and growing. So...besides avoiding the substances that you already mentioned, make sure you are taking a good multi vitamin (I recommend the liquid vitamin "IntraMax", but it is kind of expensive), eat tons of veggies and fruits (don't forget a large, raw salad once a day made with romaine or leaf lettuce [not iceburg, it has absolutely no nutrition, only water!] and colorful veggies), some whole grains, and good quality milk/yogurt/hard cheese. A flaxseed oil supplement (or add a tablespoon of flaxseeds to a yogurt/fruit smoothie) is also a good source of omega-3 fatty acids for brain formation. If you eat fish 2 or more times a week, you don't need the flaxseed supplement. (a lot of other posters mentioned the fish with high mercury; avoid them and also the raw meat, cheese ect.) Try to avoid processed foods, diet sodas, and anything containing artificial flavors or colors or aspartame as much as possible. These toxins are dangerous to a brand new baby. Avoid all medications, unless medically necessary, as well. NO medications for pregnant women have been found completely safe for mother and baby. That's right: NONE. Also, if you drink chamomile tea, skip it for the first trimester, because it can cause a miscarriage.
Take childbirth classes by a private childbirth educator (not at the hospital), if you can. They are MUCH more thorough and give you much needed information about everything from nutrition to drugs to coping techniques.
Start reading now! I suggest The Birth Book by William Sears, M.D. and Martha Sears, R.N., Active Birth by Janet Balaskas, and Natural Childbirth the Bradley Way by Susan McCutcheon. They are excellent and very informational and usually can be found at the library.
One more tip---I would recommend hiring a doula for your birth. She will really help you understand lots of stuff going on. There are many doulas in Wilmington, I happen to know one (Anna VonWagoner) who is especially awesome. Try interviewing a few in your second trimester and find one you are comfortable with. There are some that offer their services for free, because they are in training.
I hope you have a wonderful pregnancy! I hope this info is helpful.