How wonderful that you are concerned about establishing healthy eating habits at such a young age. First piece of advice a seasoned mom gave me: You will never win a battle over food.
Second piece: The child will NOT starve himself.
I know it's hard, but we went through the picky eating thing for a while with my daughter (3yrs) and I swore we wouldn't go down that road with my second child (16 mo old boy).
You can simply put nutritious food in front of him at regular times (breakfast, morning snack, lunch, afternoon snack, dinner). If he eats, hooray, if he doesn't eat, his next oportunity is at the next meal/snack. You might also find out what and when he eats at daycare. If he's getting a late snack, he just might not be hungry for dinner until late. When we came to our senses about our daughter's diet, she was closer to age 2. We picked a weekend and started sticking to our guns at breakfast -- she picked over it, didn't eat, then came whining for food an hour later, but I didn't give in. She ate a little at lunch, but still complained about what was on her plate. At dinner, she cleaned every crumb off her plate. Also, I've read that it takes about 2 weeks to introduce a new food. If you want him to eat broccoli, simply put it on his plate (just a bite or two) without saying anything. He'll probably play with it or shove it aside. That's fine. Keep putting it on there for about 2 weeks. If there are no other options (like fruit loops), he'll eventually eat what's in front of him. You must constantly remind yourself 1)that he will not starve himself, and 2) not to get into the habit of whipping out some chicken nuggets or salt-loaded, sugar-loaded alternative every time he turns his nose up at a meal. He's no dummy! He knows if he waits long enough, or whines enough, something better will come his way. I know it's doubly hard when you're working and you want to have a peaceful meal when you get home in the evenings. In fact, that's the reason our daughter's diet went downhill for a while. Some things I've figured out about getting my kids to actually enjoy their vegetables: Go organic. I bought some organic broccoli on sale once, steamed it like I regularly do, and my kids ate it like it was candy. I took a bite myself to see what was so exciting and it was pretty yummy! We'll never go back to the regular stuff! Same thing with organic baby carrots (you'll have to chop them for a toddler). Before I tried organic, we'd let them dip their broccoli in ranch or vinigrette dressing. Also, about nutrition, I worked for the American Heart Association for 5 years. I read a lot of research on nutrition and disease processes and basically learned that heart disease is a pediatric problem (and you could say the same thing about cancer, diabetes, etc.). Your child's diet for the first 12 years or so of life are what builds his body up to handle the rest of life's battle with aging an illness. I just read a great book called "Disease Proof Your Child" by Joel Fuhrman, M.D. that can be a real eye-opener for parents! Start reading labels. You'd be amazed at the junk we put in our kids (and ourselves!).