after the ann what is likely to happen

im new to the stock market. cnp is my first investment. i probably couldnt have chosen (it was advised) to buy a better stock in as much as the interest it has given me, and the motivation to research different aspects that affect any possible outcome.

i believe a possitive ann is a given, the SP will jump to $1 or more (possibly less if extention is only for a short time).

what no ammount of research can tell me is what may happen a week, a month, or a year or 2 later. is it best to sell 1st day after the ann at the peak of the run (if one can pick it)? or wait a week to see how it plays out, or a month, a year?

is it a case of set and forget? isnt that sometimes the best way? or does a bloke sell some, keep some and move on to the next share?

i realise some here day trade, etc. but is that always the best way? and another question is; will centro continue to be as volatile as in the recent past? does that have a bearing on how one should trade?

these questions are case specific.

thanks all in advance for your opinions...