Yep, it can be difficult to find Nolics details.
I would caution against spending too much time learning Nolics. Sitefinity 4.0 (which is admittedly serveral months from release) will replace Nolics with Telerik's OpenAccess ORM. In the meantime, in my own projects, I've been using my own data access code or ORM-preference for my data-access layer.
This being said, I understand you might have requirements that prevent you from avoiding Nolics. If that's the case, hopefully the team will have some guidance.