Hi SV,
There are two types of Alerts in DP planning book-Dynamic Alerts and Database Alerts.
To see in alert monitor, you have to create a database alert and this can be achieved via a macro.
So, for your first example,
IF "History" >0
AND "Forecast" = INITIAL
create Alert
And, as Alok has suggested, that is a very good document to setup Alert Monitor.
You can schedule the macro or set it as default / start, to generate the alerts.
Regards
JB