To check inventory without creating an order, select the catalog the catalog you want to see availability for. You can view product availability by clicking on a style name, and then by selecting 'Availability' from the menu. This will produce an availability table that shows both current and future availability.
You can search for products by clicking on the filter button on the bottom left corner of the screen. Enter a style number, name, or color into the keyword search and that product(s) will appear.