Get the book "The Girlfriend's Guide to Pregnancy". It's frank and funny too. It won't scare you like the "What to Expect When Your Expecting" book does. On just about any topic regarding pregnancy, childbirth, raising a child, etc. there will always be many different viewpoints. You have to pick what works best for you. Hopefully you can get some prenatal care soon too. I love this website because you're visiting with other moms who have gone or are going through the exact same stuff. You can also check out www.babycenter.com for more info. on what to expect throughout your pregnancy.
As for the bath, my opinion, is to try to avoid them. You'll also want to avoid long, hot showers or saunas too. The concern is about raising the body temperature and a bath can increase your risk for yeast infections while you're pregnant.
As for the standing or lifting...see if you can take more frequent breaks to get off your feet while at work or maybe you can sit behind the desk. Most likely, you don't have to make many changes in this area because your body is already accustomed to doing these tasks. Pregnancy does take a toll on your body so just be sure to listen to what it's telling you and try to rest/nap if you can. I'd definatly make sure you're taking folic acid or over-the-counter prenatal vitamins too. Most of all, try to enjoy it! You'll be so excited once you can start to feel your baby move and grow inside you!
Congratulations! Children are a blessing!