Uh, whoops. The Knowledge Base speaks verbatim on 2) above:
hi kevin, regarding references, almost everything is defined in the flow simulation help. if you need more information, dig into the install directory for flow > lang > english > docs. the technical reference and solving engineering problems documents will tell you more than you want to know about everything in flow simulation. the solidworks KB is also a great place. otherwise your reseller support line should be able to help you out. at Hawk Ridge, we also offer one-on-one mentoring to go over analysis topics and application of the tool for a customer's specific problem. we find that is also a really good way to learn more about the tool for your specific application and fill in the gaps from training and documentation.
side note, i find these online references a lot more helpful than printed versions because they are searchable. in the end, you can always print them!
on your questions
pressure potential, when it is enabled for a gravity problem, p = p abs - rhogh basically. so most likely if you have a pressure reading, it is pressure potential so just leave it enabled.
leave the problem as turbulent unless you know for sure it is laminar.