First of all, good luck on Your new system :)
I think, You've purchased a two way BS2300, because if I know well, the one way BS2300 already has a timer option button.
The Beocenter 2300 two way IMHO is a really better and wonderful timer system, with several timer modes, just like daily setup, single time, and a calendar. The only problem is, that You can access to the timer function only via a Beolink 5000, or a Beolink 7000, because the system by itself does not give You any possibility to set the timer functions. (The only exception is to mute/unmute the speakers during the timer functions)
As far as I know, there were rumours about a sleep timer function, but I've never seen anybody who was able to set it up :)
So, You need to purchase or ask for an advanced two way remote controller to use these features... but it worth every single penny to see this kind of a communication between the remote and the system :)