Your ganache is ready. Leave to cool until it reaches the required consistency. The colder it is, the firmer it will be.
Remarks
The proportions for a ganache are very simple: half cream and half chocolate.
Chocolate lovers will enjoy adding a little coffee (2 tablespoonsful, or 1 teaspoonful of instant coffee powder or granules) to the ganache to boost the flavour even more.
You can also add a vanilla pod to the cream to flavour the ganache.
You will note that this ganache is not sweetened, if you want a sweeter taste, you can reduce the proportion of chocolate a little and replace it with milk chocolate, or sweeten the cream to your taste.