This help page explains our Variations and Variants settings, which you can use to offer a selection of product options (e.g. size, color, style, etc.) and/or text fields for the buyer to fill in:
http://www.e-junkie.com/ej/help.variants.htm
Note that the buyer's name, email address, and shipping address (if you enable that in the product settings) will be collected automatically at checkout, so there is no need to request that information separately before checkout.
