You can specify which mode to use or maybe 'All' of them, what is time range in minutes from announced moment, when to announce, on which week days to announce, same as regular scheduler, on which month days to announce. Rewards will determine how many placed you want to reward and which rewards you want to give (again there should be separate section in config file). If you will have 10 entries, 10 people will be rewarded, if you will have only 1, then 1 will get reward. Simple. For message broadcasting, this will be shown when scheduler kick in, so you can give custom message at this time and give player names by place they will take and points/questions they have. First planer name is [1name] and points [1points], second [2name] and so on. If player is not only when this scheduler kicks in, then he will get rewards after 2min on next login with appropriate messages from reward. 