Minecraft wiki entry for How_to_play, associated text: A bucket allows you to collect things like water, milk, lava, and even fish.
Flint and steel allows you to light fires, but be careful in densely wooded areas!
A fishing rod lets you catch fish and other loot from water blocks. It can also be used to pull other players and mobs. Fishing rods can also be enchanted!
Shears are handy for collecting items like wool, leaves, and cobwebs.