Don't ever be sorry for questions! We have all been there. Mini and Regular are the same thing and the term is used interchangably. So the Mini can accept almost any regular 510 size carto and the XL will generally handle any long-length 510, as long as they are punched. Personally, I am really looking forward to trying the new Boge XXL in it, which is just an XL length Boge.
Drew does a good job carrying a good variety of pre-punched cartos that fit and work well. Or you can diy and punch your own like many do.