Customise blog-list page

Hello

I need to create a new template for blog posts. I am using blog posts for news updates, which works fine. But I am also using them for events. I am differentiating them using categories. However on the blog-list page which shows event category posts, each post displays the post date. I need it to display the event date, which I am entering in the post as a custom field. (This is working in the sidebar widget using a plugin.)

Website is http://www.middlesexrugby.com

1. Where do I find the current blog-list template page
2. Can I edit it and save it with a new name?
3. How do I attach that new template to posts with the category ‘events’
4. Most importantly – which bit of the code in the template do I need to edit to change post date to event date?

Thank you
Lonsdale