T.W.
J.,
Start with one vegetable at a time for 2 - 3 days at a time at lunch and dinner. If he tolerates it well then go onto another one. If he doesn't like one vegetable try another and go back to that other one in a few weeks. Babies are like us, they have their own likes and dislikes.
At 8 months of age my kids were eating everything, but I had to start them on cereal at 6 weeks because they were so hungry all the time. I also made my own baby food, giving them whatever we ate except for fish which I didn't give them until they were a year old or very close to it.
T.