Error occurred in deployment step ‘Activate Features’: Object reference not set to an instance of an object.

This just means that some custom EventReceiver code you have written is failing.
Comment out your code and add it in step by step until you discover the problomatic code

Add Footer to Master Page

1. Open the v4.master page using SharePoint Designer 2010 and look for:

               DeveloperDashboard

 

2.  Copy and paste the div below into code view of the v4.master page.

 

   <div class="ms-wpselectlink" style="clear: both; padding: 10px; background-color: #FCFCFC; border: 1px solid #DBDDDE;">
&copy; Copyright 2010
<span lang="en-us">Go MCD Technology</span>
</div>

 

3. Be sure the above code is immediately before the line below.

 

<SharePoint:DeveloperDashboard runat="server"/>

Create custom NewForm.aspx or EditForm.aspx for a list

Lovely demo provided here - Click Here

Reference list for SharePoint internal field names

This - Click Here lists the internal names of commonly used fields in SharePoint