Get all Document types and Fields

select
umbracoNode.id as Id,
Text as DocumentTypeName,
cmsContentType.Alias as DocumentTypeAlias,
Name as FieldName,
cmsPropertyType.Alias as FieldAlias
from cmsPropertyType
inner join umbracoNode on cmsPropertyType.contentTypeId = umbracoNode.id
inner join cmsContentType on cmsContentType.NodeId = umbracoNode.id
order by text

Object Node Type Id's

'C66BA18E-EAF3-4CFF-8A22-41B16D66A972' - Content
'A2CB7800-F571-4787-9638-BC48539A0EFB' - Document Types
'B796F64C-1F99-4FFB-B886-4BF4BC011A9C' - Media Cotent
'6FBDE604-4178-42CE-A10B-8A2600A2F07D' - Master Templates
'4EA4382B-2F5A-4C2B-9587-AE9B3CF3602E' - Media Types

Application_Start on umbraco

public class MyGlobal : umbraco.Global
{
    protected override void Application_Start(object sender, EventArgs e)
    {
        base.Application_Start(sender, e);

        // Insert your startup logic here
    }
}

in 

http://blog.mattbrailsford.com/2010/07/11/registering-an-application-start-event-handler-in-umbraco/