You're cups will be fine for veg so long as you have some drainage holes cut in the bottom of the cups. But you're gonna have to transplant them eventually. Then you're lighting is another thing that's going to be crucial to trying to guess any sort of yield one light isn't going to get you shit yo, unless you're planning to plant them outside?

Get some nice soil and don't fuck with it and add anything that you haven't researched out well in advance like not but Miracle Grow in it haha. The jars will work fine, the plants themselves my start to stink at the end of it all beware of that to.

http://boards.cannabis.com/indoor-gr...g-you-kid.html