Here's the step i've done so far (as i'm a beginner also)..
First of all, i downloaded the latest version of ec-cube on the download page
Extract the file and place the files into your xampp directory (if you use xampp) xampp/htdoc/ec-cube (for example)
Open your browser and access localhost/ec-cube/
Make a database named eccube_db
Set a new user in the privilage tab, add a new user, name it eccube_db_user, and check list all the access below (to be a superuser) and save
And then just follow the instruction..
You can open the back-end and front-end page after it..
Have fun! it's easy..