Getting one custom field, separating, and displaying in list format

Hello Everyone.

I’m working on a theme at the moment and what I’m looking to do is add a custom field with say 5 image links separated by a or something similar. I then want to get that field in a post template I’ve created and display each link as:
<li><img src="link1" blah /></li>
. I imagine the last part is just a while statement but how do I separate each link?

Thanks