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Display a list, make an edit and then save

it sounds so simple, get a list of similar items and allow the user to edit one field, then click save and return to where you came from. I just do not understand enough to make this happen, can some one take a look? When i hit save i get the page back but no updates have happened 


VF page 


<apex:page standardController="ERP_Data__c" extensions="opportunityList2Con">

    <apex:form >
        <apex:pageBlock title="{!erp.Chain__c}" >
            <apex:pageMessages />
            <apex:pageBlockButtons >
              <apex:commandButton value="Save" action="{!mysave}"/>
            <apex:pageBlockTable value="{!Opportunities}" var="o" >
                <apex:column value="{!o.Account__c}"/>
                <apex:column value="{!}"/>
                <apex:column value="{!o.Acct_RT_Name__c}"/>
                <apex:column headerValue="Program">
                    <apex:inputField value="{!o.Program__c}"/>

 and the controler


public class opportunityList2Con {
public opportunityList2Con(ApexPages.StandardController controller) {}

erp_data__c erp;
public erp_data__c geterp() {
if (erp == null){                      
erp = [SELECT Chain__c FROM ERP_Data__c WHERE 
    id = :ApexPages.currentPage().getParameters().get('id')];
   return erp;


String myTestString = ApexPages.currentPage().getParameters().get('name') ;

// ApexPages.StandardSetController must be instantiated
// for standard list controllers
public ApexPages.StandardSetController seterp {
     get {
        if(seterp == null) {
           return new ApexPages.StandardSetController(
                [SELECT name, Account__c ,Acct_RT_Name__c, Chain__c, 
                        Id, Program__c, RecordTypeId    
                 FROM ERP_Data__c  
                 WHERE Chain__c = :myTestString limit 25 ]));
        return seterp;
// Initialize seterp and return a list of records
public list<ERP_Data__c> getOpportunities()  
return (list<ERP_Data__c>) seterp.getRecords();
public PageReference mysave(){;  //call the save method on your set controller
    //;  add this if you want to save your original ERP_Data__c record         
    //as well
return null;


 Most of this code I have picked up and modified from other people projects so my understanding  on why some things are here is low. Once i get it working i will spend the time to clean up the naming spacing and comments , thanks in advance!


You can achieve this just by using standard controller,  


something like


<apex:page standardController="Account" recordSetVar="accounts">
<apex:pageBlockButtons >
<apex:commandButton value="Save" action="{!save}"/>
<apex:commandButton value="Cancel" action="{!cancel}"/> 
 <apex:pageBlockTable value="{!selected}" var="s">
<apex:column headerValue="Custom Field">
 <apex:Inputfield value="{!s.CustomField__c}" />