The wheel is a safety component!
If you are not expert in lacing, for your own safety please go to a professional one.
Steps to assemble a wheel:
         1) Find the correct wheel dimensions:
                      a.  Offset (to be measured on mounted wheel - FAQ)
                      b.  Spokes (could have different lengths on the same wheel)
                      c.  Sizes and rim characteristics (FAQ)
                      d.  Sizes and tire characteristics (FAQ)
         2) Disassemble the wheel:
                      a.  It's advisable to keep all the original pieces until the wheel has been completely changed
         3) Component settings:
                      a.  Change hub with new original part or
                      b.  Repair hub (through professional assistance)
                                   - remove bearings (to be reinstalled afterwards on hub)
                                   - steel hubs can be sandblasted then painted, aluminium ones polished
                      c.  Spokes:
                                   - shouldn't be repaired but substituted
                      d.  Punched rim:
                                   - advisable not to repair but change with new one
                                   - the hole punchings must be at precise degree to hub and rim
mozzo raggi nippli 0
         4) Manual assembly:
                      a.  Insert spokes into hub receptors 
                           (be careful of different length)
                      b.  Insert spokes according to hub requirements, the ends
                           will line up to the holes so to insert the nipples
                      c.  Before proceeding check that everything is properly
                           set (i.e. rim, hub, spokes, disk brake)
                      d.  Tighten nipples, spokes and verify offset and disk brake settings
                      e.  Place bearings and check if centered
                           by rotating wheel
                       f.  If wheel wagging occurs check spoke
                           tension (this operation is highly manual and
                           requires much patience)
                       g. Tighten nipples
                       h.  Check offset and parameters 
                       i.  Check that no spoke exits its nipple

          5) Tire fitting
                       a.  The wheel is ready for fitting (advisable to contact a professional tire fitter)
Immagine 035-1
          6) Maintenance
        a.  Regularly check spokes and make sure that there
  aren't any loose nipples
    - spokes mustn't be too tight, to avoid breaking
    - check that nipples and spokes aren't stuck
    in the holes.