Implementation of Woocommerce shop with current theme?

Hi,
I′ve installed Woocommerce in my present theme from Themeforest.com. I′ve customised all of my Woocommerce settings and then i′m lost!!!
I just need my new shop to be presented with a basket and general shop functions in just one of my pages named “Order here” which is a part of my menu (home, about us, blog, order here, contact us). I also need to have a custom form with scroll-down menus, radio buttons e.g. in this one shop page, because i sell services and subscriptions… i will just get a custom form builder plug-in for that! How do i create and implement the actual product gallery where my customers can add my services/subscriptions to cart, checkout and so on? Do i need a new theme only for my shop, and then change the CSS style in that theme in order to make it look like my original website? Or it is more simple than that?
Kind regards
René