Unless you've been using birth control, or have other medical concerns, why not start now? If you have been using bc, most doctors recommend stopping and giving yourself at least 6 months to get your cycle back on track etc.
Take Prenatal Vitamins now. They're really important for the health and development of the baby. What you put into your "stores" now are what the baby will be drawing upon for development and nourishment.
Regular daily vitamins designed for women's health do not have enough of the most important vitamins and minerals needed for baby's development during pregnancy. Prenatal vitamins have higher amounts of Folic Acid (which is scientifically proven to prevent spinal/neurological disorders such as Spina Bifida) and Calcium (which the baby needs lots of to develop his/her skeletal system. If you don't get enough calcium prior and during pregnancy, the baby will get calcium directly from you! Many women in poorer countries w/o prenatal care often develop terrible problems with bone structure and calcium stores after pregnancy because of this...so drink up and take those vitamins). Now many prenatals include DHA and even Omega-3 which are supposed to be important for baby's brain development and more. Because of all of these important requirements during pregnancy, while 2 Flinstones may be adequate, I'd say take a vitamin designed specifically for pregnancy to ensure you're getting everything currently recommended for baby's health. When you finally get in with the Doc, if you're not happy with what's available at the store, ask for a prescription from the Doc for a vitamin he/she recommends.
As for foods and activities to avoid; The obvious as you already mentioned, alcohol and smoking. It's also advisable to not eat soft cheeses (like brie), raw foods like sushi, more than 1 serving a week of sea foods (risk of mercury poisoning), and to avoid any foods that have been sitting out for long hours such as at picnics. Pregnant women are very susceptible to food borne illnesses, and almost all docs will tell you not to eat these things during pregnancy. Many sea foods like Tuna for instance come from contaminated waters and have exceedingly high levels of mercury which has been known/proven to affect the unborn.
Take it easy during summer months if you do conceive. Pregnant women are most susceptible to heat illness and complications. Drink more water and avoid too much direct sunlight. Most docs recommend against hot tubs and long hot showers because you and the baby could have complications. Your body temp is naturally higher during pregnancy, any outside fluctuations during pregnancy can cause problems. Your doc can explain more.
As for hair dying, lotions, cosmetics, perms, even tanning, there's a lot of information out there..some conflicting.
For sure, you should not dye your hair during pregnancy. Chemicals can and do leach into your system through your skin, and certain compounds in these products can negatively affect the baby.
There is some disagreement about perms. Some docs say that's okay if the stylist doesn't get the solution on your scalp. The more conservative docs say forget any all chemical treatments during pregnancy.
Tanning is another one of those things where you'll get mixed information. Many docs frown on tanning booths, saying it may not be good for the baby. Currently, there is now more information coming out about tanning lotions, sunscreens, even daily moisturizers possibly not being safe to use during pregnancy because the chemicals in them are absorbed into your system and the baby can be affected. If you want to use stuff like that, many moms are looking to organic and natural products as an alternative, otherwise are just doing without.
This growing theory about safety of products also goes for cosmetics as well. Earlier this year, it came out that many lipsticks, blushes, etc. have high levels of lead and other heavy compounds as "preservatives" in them which is an absolute no-no for pregnancy. They may be keeping the bacteria down, but they could be taking care of those wearing it as well. In fact, many big named cosmetic companies had to pull their products off the shelves. Still many more are continuing to manufacture the products with that stuff in them. The only way to know for sure is to search the internet for current information. Or, once again, the solution many moms are looking to is organic and natural cosmetics to be on the safe side.
As for most fertile time... you should read up on fertility monitoring and charting. It's often referred to as "natural family planning". By reading certain but reliable body signs that a woman has each month, you can determine the window of days fertility is optimum. The window is 1-3 days for most. But if you can master this skill, it will be most beneficial for family planing. It works barring you don't have any underlying medical illnesses or problems. And even then, with the help of a doctor skilled in this area, you can still conceive.
You could also get a fertility monitor from the drug store, or the ovulation test strips..but these are really expensive..and only give you a general idea of when to try. It can take a few tries with these before conception. However with the natural method, most concieve right away.
Books you may want to read that address both your nutrition questions and the fertility question are:
The Art of Natural Family Planning, by John and Sheila Kipley
The Ovulation Method by John Billings
Your Fertility Signals by Merryl Weinstein
Fertility, Cycles and Nutrition, by Marilyn Shannon
The Natural Pregnancy Book, by Aviva Jill Romm
The Complete Organic Pregnancy, by Deirdre Dolan