Hi All, I am a salesforce admin trying to move this trigger with 0 % code coverage into prod. I understand the code but not sure how to write a test class. Help !!!!!

trigger UpdateContactInfo on soship__c (before insert) {
   
soship__c[] shipments = Trigger.new;    
Set<String> orderNumbers = new Set<String>();    
Map<Id,sohdr__c> orders = null;   
sohdr__c order = null;

for(soship__c ship : Trigger.new ){
       
     orderNumbers.add(ship.soship_order__c);       
     System.debug('order number '+ship.soship_order__c);    
     }    
    
  
  orders = new Map<Id,sohdr__c>(           
 [Select Id, sohdr_order__c,  sohdr_contact__c, sohdr_conemail__c,sohdr_conphone__c ,sohdr_conmethod__c                  
             from sohdr__c where Id in :orderNumbers]);
       
    for(soship__c shipment:shipments){      
        order = orders.get(shipment.soship_order__c);
        
      if(order != null  ) {                                    
      shipment.soship_contact__c = order.sohdr_contact__c;               
      shipment.soship_email__c = order.sohdr_conemail__c;            
      shipment.soship_phone__c = order.sohdr_conphone__c;          
      shipment.soship_conmethod__c = order.sohdr_conmethod__c;                    
      }else
          {            
         system.debug(' order is null' );                 
          }
           
}

}
} }
}