I've spent today hosting a lighting workshop on portrait & artistic nude photography, and I'll give you the same answer that I gave my people today...
Posing: Look at examples produced by other people, see what you like and see whether you can do something similar or better. Tell your model what you're looking for (maybe show her the examples) and ask her to adopt poses that she is happy with - bear in mind that not all models are equal, so don't ask a model to adopt a pose that she can't manage easily, if she's struggling to adopt or hold a pose then the shots will look unnatural.
Light placement: IMO all books that advise on light placement are a waste of time and money. Lighting is the most important element, but has to be individual to suit the subject, the size etc of the studio, the equipment available to you and the type of effect you want to achieve. Therefore, lighting is the LAST thing you arrange after making decisions about pose, camera height, head angle and so on - which means that any advice to put a light here, there or whatever is nonsense. These books will show you how to get bland, mediocre results at best.
Get yourself a copy of Light: Science & Magic (3rd edition). It explains the physics of light in laymans language and will help you to understand light. Once you understand light you will also understand how to get different lighting effects by using different lighting tools in different positions.
Or buy my written tutorials and/or videos, which again deal with principles and give examples, and which don't give lighting setups.
