The Bead Head Pheasant Tail is one of the most popular trout flies ever, and it works anywhere trout swim. This is a great pattern to learn for the beginning tier!
Hook - 2XL Nymph Hook
Bead - Copper Bead
Weight - Lead Wire or Lead Free Wire
Tail - Pheasant Tail
Abdomen/Body - Pheasant Tail
Rib - Copper Wire
Thorax - Peacock Herl
Wingcase - Pheasant Tail
Legs - Pheasant Tail
Here's a chart of what size beads to get for what size hooks -