Checklist:

You need at least these components to build a MikroKopter:

FlightCtrl board
4x BrushlessCtrl boards (speed controllers)
SerCon board (for programming and debugging)
4x Brushless Motor (eg: Robbe ["ROXXY2824-34"])
[:RC-Empf%C3%A4nger:Receiver] (35Mhz) that offers the "multi" signal (muxed signal holding all channels)
6-channel Sender (35Mhz)+battery+charger (most used: Graupner MC12, MX12 which have extra switches)
cristal-pair for both sender+receiver
Frame material (most used: [:MK-40-Rahmen:10mm square Alu profile with 40 cm Motor-distance] and 2x CenterPlate)
4x Propeller EPP1045: 2x clockwise-rotating, 2x counterclockwise-rotating (if possible order 10 pairs or more) (order at Lipoly.de or CNC-Modellsport.de). Alternative: X-Ufo (8") props for smaller MK's
Prop-holders or Propsaver (fit for your Motor). NOTE: EPP1045 requires a 3mm shaft
LiPo-Battery (if possible at least 2)
LiPo-charger + balancer
other small parts like fasteners, cables, connectors

English wiki pages