Show =required information along with red bar on the Page Block section of VF Page

Set the apex:pageBlock mode="edit".

<apex:page standardController="Account">
        <apex:pageBlock mode="edit" title="Account">
            <apex:pageBlockButtons >
                <apex:commandButton action="{!save}" value="Save"/>
                <apex:pageBlockSection columns="2" title="Account Information">
                    <apex:inputField value="{!Account.Name}" required="true"/>
                    <apex:inputField value="{!Account.Phone}"/>

Redirecting Back to Previous Page Using Visualforce Page StandardController

Visualforce Page Button:

<apex:commandButton action="{!back}" value="Back"/>

Apex Controller:

public with sharing class ExampleController
    private ApexPages.StandardController sctrl;
    public SaveAndReturnController(ApexPages.StandardController stdController)
        this.sctrl = stdController;
    public PageReference back()
        PageReference cancel = sctrl.cancel();
        return cancel;

Add Fields in ApexPages.StandardController

If you want any fields value then you need add the field API name in standard controller.

public with sharing class AccountControllerExt
	public Account acc {get;set;}
	public AccountControllerExt(ApexPages.StandardController stdController)
		stdController.addFields(new List<String>{'Name', 'Region__c', 'TAX_ID_Number__c'});
		this.acc = (Account)stdController.getRecord();