How to feed a picky eater??

Now, I am in a stage where I have a hard time thinking what food should I give to Lukee and what food will he is going to like to eat. Little did I know that kid can really be picky. Before when I don't have a son of my own, I've watched advertisements showing kids who are very picky in their food, and now, I am experiencing the same. The bad thing is I don't have any idea what food I should give him. He seems to like food that is new to him. For instance, if he already a sausage for his breakfast do not expect him to eat the same at dinner. Or if he ate his sausage today do not expect him to eat sausage tomorrow. Whew!!!

And, hubby and I bought him a kids cuisine but he won't eat what's in the platter. He eats only what he wants and he won't eat the rest. Most of the time the food just wasted, which I didn't like that to happen.