My wife's H1B petition is approved and her visa appointment is in January. Should I apply for an H4 visa appointment along with hers or should I wait till she gets her H1B visa? I am currently studying and will finish my course in a year from now. I'll be able to join her only after a year. Am I going to get an H4 visa?

I currently trade in the Indian share market (BSE & NSE) through the internet. As I will not be allowed to work on H4 visa in the USA, can I continue to trade on the internet? Are there any legal issues?

Given my case, what questions can I expect during the interview?