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:

<fieldset class="fieldset">
				<legend>$vbphrase[singco]</legend>
				<table cellpadding="0" cellspacing="$stylevar[formspacer]" border="0" width="400">
				<tr>
					<td colspan="2">$vbphrase[singcolong]</td>
				</tr>
				<tr>
					<td>
						$vbphrase[singco]:<br />
						Favorite Desert <input type="text" class="bginput" name="FavDessert" value="single" />					</td>
				</tr>
				</table>
			</fieldset>

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