Dried versus fresh herbs
When substituting dried herbs for fresh herbs use approximately a third of the suggested quantity, as dried herbs will tend to be more pungent. However, the older the dried herbs the less flavour they will have, so taste as you go.
How to store spices
Spices will generally be at their best for up to a month, if stored correctly. Store spices in an airtight container in a cool, dark place. Humidity, light and heat will cause herbs and spices to lose their flavor more quickly.
Toasting whole spices in a dry pan over a low heat helps bring out the essential oils and flavour in the spice. However, be careful to taste as you add the spice to your dish as the flavour will have changed and you may need less. Toasting pre-ground spices is a little trickier and it can ruin the flavour of the spice altogether.