Shopping requirements for a complete hydroponic system.
And the choices you will have to make for each.

Grow light equipment

• Ballast
  • Electronic or magnetic
  • What wattage, what brand
• Reflector
  • Lots of choices, see buyer's guide
  • Compatibility with ballast
• Grow light / bulb
  • HPS/MH or LED
  • What wattage, what brand
• Reflector hanger
• On/off timer

Hydroponics

• Grow medium (choose: soil, water, coco, hydroton, other)
• Pots/containers (depends on grow medium)
• Air pump & air stone (match size to your system)
• Water pump (match size)
• Tubing (match size)
• Timer
• Reservoir (for mixing nutrients)

Ventilation / climate

• Inline fan(s) (what size, what brand)
• Ducting (match size)
• Filter (Phresh filter, match size)
• Thermostat
• Optional: Climate controller (how many different elements you want to control)
• Optional: Air conditioner (maybe not optional depending on the time of year)

Nutrients

• Nutrient line (what brand, see buyer's guide)
• pH up and down
• pH meter (continuous or not)

Popular

• Grow tents (see grow tent review) 
• Secret Jardins rate 
• Grow light packages
• T5 grow lights (for seed starting and cloning)