Your line styles and lineweights are controlled under visibility graphics(VG is the shortcut). You can adjust different families under the model tab categories (doors, wall etc), annotation categories tab (tags, dimensions etc) and imported categories tab where you can adjust the visibility of your imported line DWGs and so on.
Revit is really flexible and you don't need to draw lines, it's just a different approach.
I suggest you create a template with all your office standards in Revit like kris McIsaac.
Here is a link to a really good Revit tutorial set... Really cheap cos' it's based on Revit 5 but the core workflow is intact. Families and customizing parameters are discussed in depth.
http://www.scottonstott.com/courses/cd4.html