I'm kinda at a loss here without a little more info. Typically these should come with instructions on wiring and assembly. My suggestion is to contact the salesman you spoke to, and ask him if he can send you any literature on the unit.
Also, if you're not familiar with electrical work, PLEASE!! See if you can have a friend help out that has at least a little experience. Electrical work, especially these ballasts and lights, needs to be done by someone with a clue. I dont mean any disrespect. I just don't like hearing that someone was too ignorant or impatient to ask for help.
Good luck. If you can get us some more info, specifically a model number, then we might be able to find something to help you out.