Ubercart Shopping Cart - Help : configuring the store

I have installed the ubercart and associated modules for that.
After reading the users help, Iam a bit confused with the configuring store and basic product creatuion.
Can any one who has set up a cart after installing module guide me to add some products in the category for shopping to users.

Iam confused with the step by step procedure to set up product class, product manage attribute,option,
assigning attribute to products, manag eproduct class, building product catalog, product kit and so on.
Are these mandatory to set up a cart.

i want to set up a shop similar to http://livetest.ubercart.org/catalog.
Is the product kit and other stuff required to set up a shop.
What are the minimum factors required to set upa cart like http://livetest.ubercart.org/catalog.

Please help

Santy