Where can I get a blueprint of drawing of the dimentions that I want ?
Typically your builder/contractor will draw up the plans for you and pull the necessary permits.
See if these help you get started.
You could try googling "deck blueprints" and add in your dimensions. There should be lots of different ideas. If you click on images under the search bar it will show you just pictures then you click on any you like, then click on the picture a second time ANF it will give you the option to go to the website