http://www.vegbox-recipes.co.uk will help in the future if there are things you get you aren't familiar with. Click the 'identify' section for pics and recipe links on the site.
Fennel can be eaten raw in salads, or stir fried, stewed, roasted - eat with meat, poultry, fish - try wrapping monkfish fillets round some bay leaves, tie with string to make a parcel, and bake on a bed of fennel....
Eat the soft green tips of the bulbs as well as the white base, or use them to decorate dishes. Cut off the hard root bit before cooking. Do not overcook either. Careful about using with too many other flavours as it has a quite distinctive aniseed flavour that can overpower other subtle tastes.