The paper "Algorithms for the fractional calculus: A selection of numerical methods" by Diethelm et al (2005) in Computer methods in applied mechanics and engineering, vol 194, pp 743-773 gives a very good review. In the paper's own words, it gives the newcomer "the necessary tools required to work with fractional models in an efficient way" --- this paper would be a good place to start...good luck
I suggest you to read the paper "Fractional differential equations solved by using Mellin transform" by myself anf prof. Mario Di Paola. You can find it at the following wesites:
http://arxiv.org/pdf/1402.5949.pdf
http://dx.doi.org/10.1016/j.cnsns.2013.11.022
It is about a very powerful and versatile technique to solve fractional differential equations with constant coefficients by using the mellin transform. Very breafly, what we do is to transform the equation in the complex (mellin) domain, solve for a discretization of the transformed unkown function, and recover the solution in the time domain (or in whatever other physical space) by applying the discretized version of the inverse Mellin transform.
*Numerical approaches to system of fractional partial differential equations by H. F.Ahmed, Mohamed S. M.Bahgat, MofidaZaki
* Numerical Methods for Fractional Order Singular Partial Differential Equations with Variable Coefficients by Asma Ali Elbeleze, Adem Kılıçman, Bachok M. Taib
* Algorithms for the Fractional Calculus: A selection of Numerical Methods" by K.Diethelm, N.J.Ford, A.D. Freed, Yu. Luchko , Computer Methods in Applied Mechanics and Engineering, 194(2005), 743-773.