Standard Schedule Batch...

SampleBatch.cls

public with sharing class SampleBatch implements Database.batchable<sObject>, Database.Stateful {
    
    public Database.QueryLocator start(Database.BatchableContext BC) {
        String query = '';
        query += ' SELECT ';
        query += ' Id ';
        query += ' FROM ';
        query += ' Account ';
        return Database.getQueryLocator(query);
    }
    
    public void execute(Database.BatchableContext BC, List<Account> accounts) {
    
    }
    
    public void finish(Database.BatchableContext BC) {

    }
}

SampleBatchScheduler.cls

global class SampleBatchScheduler implements Schedulable {
   
    global void execute(SchedulableContext SC) {
        database.executebatch(new SampleBatch());
    }
}