Hi,
   Can someone refer to me a good resource for simulating different fading
channels? I understand the theory but get a little confused when it comes
to simulating them. Thank you.

You could have some look at the GSM standard:
http://www.3gpp.org/ftp/Specs/archive/45_series/45.005/45005-b10.zip
TS 45.005 appendix C.1 to C.3

Only two pages of text, with two relevant equations. 
Read the first one as convolution between the input signal with a
time-varying path. The latter is Fourier-transformed to time domain using
its Doppler spectrum. 
The second one defines the Doppler spectrum (see Wikipedia etc).

It's by no means everything there is to know on the topic, but IMO a good
starting point: It can sometimes be hard to see the forest through the
trees, as channel modeling is a quite popular research topic.

BTW, the mentioned equations can be implemented in a few lines of code
using FFT on the whole signal, if you're allowed to process the whole
simulation length in one shot (that is, not a "streaming" simulator).