trigger createOnboardingOnOpportunityWon on Opportunity (after update) {

List <Onboarding__c> OnboardingToInsert = new List <Onboarding__c> ();
// or whatever your custom object name put instead of Sponsorship__c

for (Opportunity o : Trigger.new) {


// here is where you check if opportunity that is being inserted
//meets the criteria
if (o.StageName == 'Closed Won'){

Onboarding__c b = new Onboarding__c (); //instantiate the object to put values for future record

// now map opportunity fields to new vehicle object that is being created with this opportunity

b.Name = o.Name; // and so on so forth untill you map all the fields.
b.Account__c = o.AccountId;
//Monthly_Transactions__c
//Current_Software_Platform__c
//Operating_States__c
//Underwriters__c
//Number_of_employees__c
//Pains__c
//LeadSource

//**Next Step = "Send intro email"


//once done, you need to add this new object to the list that would be later inserted.
//don't worry about the details for now

onboardingToInsert.add(b);


}//end if

}//end for o

//once loop is done, you need to insert new records in SF
// dml operations might cause an error, so you need to catch it with try/catch block.
try {
insert OnboardingToInsert;
} catch (system.Dmlexception e) {
system.debug (e);
}