I have photoshop cs2 trial, and im brand new at this. i was wondering how i would render a pic so i dont have to use a stock

Go to planetrenders.com
Register (it's free)
Search for a render you like, and the click on it.
In the new box, right click and save the picture.
When you open it in photoshop it will already be rendered for you.

A render is an already cut out part of a stock photo.

or if you want to render yourself, google some tutorials-

basically you can use layer masks and pen tool for rendering - best resically you can use layer masks and pen tool for rendering - best results.. using eraser just sucks, it's only good for some soft parts but you can do it with layer mask aswell