Congratulations! The good news is that you don't really have to know what you're doing. Your body knows how to grow a baby, you get to go along for the ride! You probably know that exercise is really important while you're pg, it will make labor and delivery easier and cause you to not gain as much weight.
At this point, keep down what you can... the baby will get what it needs. It is important to take your prenatals if you can. If you can't (mine made me sick), 2 Flinstones chewable vitamins have the exact same ingredients as most prenatals except for the high calcium. A calcium supplement will work for that.
The morning sickness will likely pass by week 14 and then you can worry more about nutrition.
Enjoy this time; it just flies by and is so precious!