Show images as gallery in single post.

Hello,maybe I just got blind looking at the screen for to long but:

I have a CPT where I can upload images (multiple allowed)!

How can I show the images (thumbs) that I have uploaded in the single view "Content Template" with a link to open the full images in lightbox??

1. How get the <a href… > around the images when creating a Content template?
2. how can I get the URL of the image (just the one URL, not all URLs separated by , or anything else)?

Thanks!
Gregor