The most comprehensive description is provided by the Master Chemical Mechanism
http://mcm.leeds.ac.uk/MCM/
Depending on the specific needs you can obtain a simplified scheme. Exploring the options provided in the Leeds site is very educational and rewarding experience.
The practical aspects of the chemical kinetics from the point of view of WRF-CHEM model are discussed in the following presentation
Based on my past experiences I'm convinced that it is important to invest some time to analyze the master mechanism before starting the actual calculations with a simpler kinetic scheme.
I also recommend to start from a detailed mechanism like MCM, depending on your specific objectives.
If you also want to make comparisons with a lumped mechanism, you should resort to RACM (Regional Atmospheric Chemistry Modeling):
Stockwell, W. R., Kirchner, F., Kuhn, M., and Seefeld, S.: A new mechanism for regional atmospheric chemistry modeling, J. Geophys. Res., 102, 25847–25879, 1997