Batch Apex Class:

global class AccountBatchApex implements Database.Batchable<sobject>{
    
    global Database.Querylocator start(Database.BatchableContext bc){
        String soqlQuery = 'SELECT Name, AccountNumber, Type From Account';
        return database.getquerylocator(soqlQuery);
    }
    
    global void execute(Database.BatchableContext bc, List<Account> scope){
        for(Account acc: scope){
            //Write your logic
        }  
    }
    
    Public void finish(Database.BatchableContext bc){ 
    }
}

Apex Trigger:

trigger AccountTrigger on Account (after insert) {
    List<Account> accList = new List<Account>();
    for(Account acc : trigger.new){
        if(acc.Type.equals('Customer - Direct')){
            accList.add(acc);
        }
    }
    
    if(accList.size() > 0){
        AccountBatchApex objBatch = new AccountBatchApex();
        Database.executebatch(objBatch,200);
    }
}