I got a good book for christmas called 'Snap', it's a collection of sport photos from some great photographers, it doesn't give you info on how to take shots, but gives you great creative ideas.
I haven't used the 70-300mm ED, so can't comment on the glass, but as with most sport, more focal length is good. 300mm should get you fairly close to the action, especially if your son is still playing junior cricket.
I got photos at the ODI final last year with the 70-300G (long since sold to someone else
) and with a bit of cropping I got in fairly close to the action from the Doug Walters stand at the SCG.
If it's a nice sunny day, make sure you try to use as fast a shutter speed as you can. If you find it is overcast, then sacrifice ISO for speed, and increase the ISO. You can always remove the noise later if it is an issue.
You may also wish to get an inexpensive monopod (depending on how serious you wish to get), as at 300mm even small movements with a fast shutter speed will result in loss of sharpness.
Just looking through my books I really have nothing I can recommend, as everything I've learned is either from this website, DPreview or by trial and error.
Good luck, expect to see some pics from the match come Monday!