By default, each theme will, or at least should, be able to display CPT archives/single posts. You should be able to see the archive at http://www.domain.com/CPT-SLUG/ where "CPT-SLUG" is the slug you chose. Unless you tailor your theme to have custom templates for the CPT, it'll fall back to archives.php to display the archive. If you don't have a template for that, it falls back to index.php. Same thing with single posts, single.php and then index.php
If you need to display them in custom locations or do custom things with them, then you'll need to use the WP_Query class to query for the posts in the post type, or if you're going a bit advanced, use the pre_get_posts hook to add them to already existing loops.
Hope that answers your questions, but feel free to ask more, I'll get to them when I can.