what is the code i have to put in the modifyed 'page' post type template?
If you look at the Custom Fields page on WordPress codex, you can see the functions for Custom fields.
The "Template Tags" are the functions you generally use on your template:
Follow the links to each function to see examples on how to use them.
UPDATE: Ok, now I understand. You should try to add as many details as possible in your question for us to understand. As kaiser says, you should create a loopand add
Easy: modify the query... (and add some comment on top to make a template out of this...)