There is no included amount of “gold” variable. But you can access the actor’s health values. Better let’s call the integrated stuff “properties” for now to make a difference between properties and user defined variables.
You cannot change the appearance of your weapon for now, but you can activate or deactivate it and are able to increase or decrease its power – of course also at runtime.
To get a hunch, which properties are available, just have a look on your actor’s properties in design mode.