Hi Missy - Great Electrical Repair Question!
From the information you've provided, the flickering of lights could be due to a loose or bad connection which should be checked by a qualified electrician. If one light fixture is flickering then the problem could be isolated to that fixture and the associated wiring serving that fixture. If there are other fixtures that are flickering at the same time, then this could indicate a loose splice, connection problem at the electrical panel or a possible problem with the circuit breaker or fuse. An electrician would troubleshoot the problem through a process of elimination and series of voltage tests until the trouble is identified. I would sincerely encourage you to have a professional diagnose the situation