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Difficult to say without knowing what electrics you have.

The usual arrangement is to have a charger that, when hooked up, this continually supplies the battery, which in turn runs the 12v curcuits. (Lights,water pump, radio etc).  Without a battery in place,  the circuit will not be complete, and so things will not work. (as you discovered)

You can also have a 12v transformer arrangement as you suggest.

In any case, a battery is a good idea, as then you don't need the 240v hook up.

Probably, the best thing to do is pop into your local camping/caravanning outlet and ask them to check what you have and havn't got.

John Jory