Hello Missy and welcome to our family, so glad you could join us.
I would offer the vegetables in different ways, raw, cooked, mashed, chopped or other ways to see which way he prefers them, he may like his carrots raw, his sweet potatoes mashed and so forth, sometimes they will eat a particular one a certain way and not the other so experiment to find out.
About the biting, he is young, just a baby and they use their beak as a human baby child would use their hands, they explore and he is testing you also so when he bites tell him firmly "No, no bite" and put him back on the stand and turn your back on him for a few minutes then try again. It also helps to be able to read his body language and there is a thread about that in the training room, it will prove to be very helpful in the coming days, weeks, months and years.