Integrating IMCEimage field with my module

Hi there,

I'm creating my own module which sets up a custom content type with just a standard title (No 'body') and a series of custom fields. One of which is an image field where I want people to attach/modify an image link.

I've got two questions:

1) I have been in the past using the IMCE CCK module which allows me to add a IMCE field when creating a custom content type through the CCK interface, but how can I create this type of field directly within my own node create/edit form declaration in my own developed module?

Originally I had the following for an image field:

$form['mainimage'] = array(
	'#type' => 'file',
	'#title' => t('Main image'),
	'#description' => t('Main image field for Cartoon of day block'),
	'#default_value' => isset($node->mainimage) ? $node->mainimage : '',		
);

After a good search around, I couldn't find anything which gave any hints, so I tried swapping:

'#type => 'file',

with:

'#type => 'imceimage',

Which actually produces the "[Add image]" link, but doesn't do anything when you click onto it. I think because its missing a fieldname from the end of the URL, but i'm not sure.

Am I on the right tracks?

2) Is there any way I can prevent my content type from displaying anywhere as a page, and only just as a Block view that I define within my module?

Any suggestions/ideas on the above would be really welcome! Many thanks in advance.