It is actually very rare that a mother does not make enough milk as long as she is feeding on demand. Many mothers believe they are not making enough because their baby eats all the time...but the truth is, for the first couple months, your baby DOES eat all the time!!! It's normal! Be prepared to feed every two hours (from start of feeding to start of feeding. Meaning, if your baby takes 45 minutes to finish eating, you will be feeding again an hour and 15 minutes later!) I will not lie, sometimes it's frustrating how much a newborn eats. It's exhausting. But it gets better; you just have to hang in there.
Another thing that makes women think they're not making enough is they pump "just to see" how much they've got. However, if you're feeding on demand, you're not going to get much from pumping. Your body is amazing. It adjusts to exactly what your baby needs. There is not a lot of leftovers

And babies are much more efficient at getting milk than a pump. Sometimes, babies can get twice as much milk as a pump! So pumping is not a good determination of how much you're producing.
The best advice I can give to ensure a good supply is: nurse, nurse, nurse! In the beginning, nursing should be the first thing you try when your baby fusses. Don't try to follow the clock, thinking "my baby just ate 30 minutes ago, she can't possibly be hungry." Yes, she can! The more your nurse, the more milk you will make. It's all supply and demand. Also, allowing your baby to nurse for comfort will help your supply. One of the best things I was told in the beginning was: for the first four to six weeks, forget about EVERYTHING (housework, etc). Your sole purpose, full-time job is to nurse your baby and take care of yourself by resting and eating and drinking properly.
The best thing you can do is educate yourself! Read as much as you can. I love the site
www.kellymom.com It has a lot of great info. And take a breastfeeding class! Most hospitals offer them for free or cheap.
Good luck!
Me (29). DH (40). DSD (15). DSS (9). DS1 (2). DS2 (10/6/10).