you can try using some free documentation as:
- Revit MEP 2011 User Guide : http://images.autodesk.com/adsk/files/revit_mep_2011_user_guide_en.pdf
- Autodesk Revit MEP 2014 Fundamentals : http://www.sdcpublications.com/pdfsample/978-1-58503-805-3-2.pdf
- a lot of materials can be found on Autodesk University : http://au.autodesk.com/au-online/classes-on-demand/search?full-text=Revit&productName=Revit+for+MEP+...
- http://www.aec-area.co.uk/RME-Tutorials.htm
- and of course videos on Youtube as for instance those made by Man and Machine :
https://youtu.be/d5cPBLxqNoE
https://youtu.be/txRi5fD1ej8
https://youtu.be/-_thZf_48YA Man&Machine
https://youtu.be/otKBCITmgU4
https://youtu.be/AKksOWkS33g
https://youtu.be/49o2LBNsa20
For a higher level of study and not for free , you can study :
- Mastering Revit MEP by Don Bockmiller , Simon Withbread and Don Morrison
- or video tutorials made by Paul Aubin and others on Lynda.com
Constantin Stroescu
In addition to things constantin mentioned.
Depending on your background on Revit. Have you worked with Revit before? Have you worked in other BIM and/or Cad programs?
If you have never worked with CAD or BIM before a more basic course might be suitable.
Also if you have never worked with Revit, try to get some basic Revit course. Lots of things found on the internet are geared to a single problem. A good basic course will get you a better comprhension of Revit and how everything works together. After that solving a single problem will be much easier
You can find these courses in books (e.g Mastering Series), video tutorials (lynda, infiniteskills) or classical (e.g. Autocad Reseller).
Louis
Please mention Revit version, especially when uploading Revit files.