Display custom object and fields with Visualforce - apex-code

Question

I have a custom object called Conference. I need to create a simple visualforce page that displays all records of Conference including the following details per Conference: Name, City, State, Start Date, End Date, Expected Attendess, and Actual Enrolled. I built this with standard Salesforce.com admin point-and-click, and they all display perfectly in a report I created with point-and-click.
With the following code I'm getting this error:
Error: Unknown property 'Conference__cStandardController.conference'
<apex:page standardStylesheets="false" showHeader="false" sidebar="false"
standardController="Conference__c" recordsetVar="conf">
<apex:stylesheet value="{!URLFOR($Resource.styles, 'styles.css')}"/>
<h1>Conference Details</h1>
<apex:form>
<apex:dataTable value="{!Conference__c}" var="confItem" rowClasses="odd,even">
<apex:column headerValue="Conference Name">
<apex:outputField value="{!confItem.Name}"/>
</apex:column>
<apex:column headerValue="City">
<apex:outputText value="{!confItem.City__c}"/>
</apex:column>
<apex:column headerValue="State">
<apex:outputText value="{!confItem.Location_State__c}"/>
</apex:column>
<apex:column headerValue="Start Date">
<apex:outputText value="{!conference.Start_Date__c}"/>
</apex:column>
<apex:column headerValue="End Date">
<apex:outputText value="{!conference.End_Date__c}"/>
</apex:column>
<apex:column headerValue="Technologies">
<apex:outputText value="{!conference.Technologies__c}"/>
</apex:column>
<apex:column headerValue="Expected">
<apex:outputText value="{!conference.Number_of_Attendees_Expected__c}"/>
</apex:column>
<apex:column headerValue="Currently Enrolled">
<apex:outputText value="{!conference.Enrolled_Attendees__c}"/>
</apex:column>
</apex:dataTable>
</apex:form>

Answer 1

You already refered sObject Conference__c to conf.
Therefore in your dataTable you should write your code like this:
<apex:dataTable value="{!conf}" var="confItem" rowClasses="odd,even">
<apex:column headerValue="Conference Name">
<apex:outputField value="{!confItem.Name}"/>
</apex:column>
and so on

Answer 2

<apex:enhancedList> might be your new best friend.
But if you want to keep the code you have so far you'd need to loop (meaning reference it in dataTable/pageBlockTable/repeat) over the variable name you've chosen as the "recordsetvar" attribute. Check out this link for more info.
Something like that should work:
<apex:page standardStylesheets="false" showHeader="false" sidebar="false"
standardController="Conference__c" recordSetVar="conferences">
<apex:pageBlock>
<apex:pageBlockTable value="{!conferences}" var="c">
<apex:column value="{!c.Name}" />
</apex:pageBlockTable>
</apex:pageBlock>
</apex:page>