The entry happens when the correction against the trend in one time frame higher ends. The prices start tracking the main trend again. This is the time to board the train and let the main trend take away the price long way from entry.
Catching the end of correction is easier said than done as some false signals will be always there. Some ways of tracking the end of correction are moveing averages (turning in the direction of main trend) or break of trend lines in the direction of the main trend.
Profit booking can be done based on targets calculated based on support / resistance levels or locked in with a trailing stop using concepts such a Parabolic SAR etc.