The Search for Helpers quest becomes available once you have upgraded the Trader's Tent to level 3. It will allow you to access the Apprentice's Workbench #1. Click on this Apprentice's Workbench to start the quest.
 
The quest includes 7 stages with a time limit.
 
Stage 1 (24 hours)
Collect 5 cushions (Wooden House)
Collect 2 sleep masks (Bus Station)
Collect 14 strawberry cocktails (Pub, Upgraded Pub)
 
Stage 2 (24 hours)
Collect 37 towels (Recreational Cottage, Upgraded Recreational Cottage)
Collect 42 throw blankets (Colonial House, Upgraded Colonial House)
Collect 16 cups of tea (Coffee House, Upgraded Coffee House)
 
Stage 3 (24 hours)
Collect 3 strong ropes (Kindergarten)
Collect 18 shovels (in friends’ cities)
Collect 29 aqualungs (Shoe Shop, Upgraded Shoe Shop)
 
Stage 4 (24 hours)
Collect 8 coffee tables (Furniture Factory)
Collect 9 tool kits (Shopping Center)
Collect 7 chairs (Family Restaurant)
 
Stage 5 (24 hours)
Collect 15 chainsaws (Ranch, Upgraded Ranch)
Collect 7 scooters (Pizza House)
Ask friends for 12 propellers
 
Stage 6 (24 hours)
Collect 47 welcome mats (Shoe Shop, Upgraded Shoe Shop)
Produce 16 lots of silk (Textile Factory, Upgraded Textile Factory)
Collect 9 reinforcements (Cargo Port)
 
Stage 7 (24 hours)
Collect 43 pens (Stationery Shop, Upgraded Stationery Shop)
Collect 2 folding notepads (Press Center) 
Ask friends for 15 ancient books
 
 Once the Apprentice's Workbench is restored, you will be able to craft items there. 
 
 
 You will also have access to restoring the Apprentice's Workbench #2 and upgrading the Jeweler's Stall. 
 
 
 After upgrading the Jeweler's Stall to level 2, you will be able to produce a jewelry set there. 
 
 
The quest to build Apprentice's Workbench #2 is called "Knowledge Transfer".