Changing reg template/storing custom fields

[youradultworld]

I am adding custom fields to my registration template, not through admincp as I want the field(s) to be listed below username and above the password. But lets say for instance the input field name was "fav_dessert", besides having to add this below the username stuff in the registration file:


Code:
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Since I created this myself I imagine I will need to create something in the database, but where? Also how do I tell vbulletin (or the registration system) to include this new question that I manually added to register template to the database so that I can later manipulate data?

Thanks