I am trying to build a stand up shower from scratch, my measurements that I have to work with are 34x34. I am trying to install this shower on the sec ond floor so I need to know how it is done step by step starting with the vapor barrier. Thank you.

I am always amazed to see folks who have never done a shower from scratch but want to try. I do showers all of the time and prayer for home owners who want a fabricated pan because they are so easy to put in. If you must have a scratch pan try this link. How to Build a Shower Pan

You should look into the Schlouter pan system. Made of dense stryofoam that you can cut using a table saw.
Talk to a flooring company, big box stores will not have one of this quality or price. Big box stores will charge over $600, schlouter pan that I bought is 60x32 and was $90

I used a swanstone shower floor for my shower. I took the model number and ordered it through Home Depot. It turned out to be cheaper than ordering through Swanstone. I chose white to match the toilet and sink. The tiles can always be changed out by future homeowners. I am very happy with the swanstone shower base. It's been used everyday for 2 1/2 years and no problems with it.

http://www.theswancorp.com/index.php?prod=341
http://www.google.com/products/catalog?q=34+x+34+shower+floors&hl=en&rlz=1T4TSHB_ enUS265US265&prmd=ivns&biw=1256&bih=558&bav=on.1,o r.&wrapid=tlif129828441149810&um=1&ie=UTF-8&cid=14911512222681260032&ei=gD9iTZ2ALM3SgQeXz7zZ Ag&sa=X&oi=product_catalog_result&ct=result&resnum =3&ved=0CGIQ8wIwAg#