1.  Be honest with customers as to timelines and challenges.
  2. Take inventory of print consumables and Tshirt Stock.
  3. Develop formulas to check Staff productivity.
  4. Don’t take on orders you cannot handle.
  5. Open communication lines
  6. Be organized and adequately trained on printing machines.
  7. Understand your costs and pricing matrix
  8. Evolve with technology
  9. Take safety measures
  10. Be prepared to work

Read more here 20-biggest-tshirt-shop-mistakes