Using a Trellis System - Your trellis system will need some kind of support: posts or Studded T Posts driven into the ground are typical solutions. Lace heavy twine or wire and pattern string from top to bottom to support the crop. - My Garden Win
Step by step directions for building a seed growing rack. - I did this last year with a similar rack & just have an actual grow light for the top shelf and use lower shelves as storage for pots, soil, etc.