I keep getting stuck, anyone got any advice?

I went to college and did games development but none of us really got taught in Maya, I have subscribed to digital tutors and got a 3D buzz DVD (I don't think I have even completed one tutorial).

I have recently tried high poly modelling, I modelled a Remington ACR but ended up getting stuck on the sights and now I'm modelling a Scar-H or L and I just can't seem to model the stock. Does anyone have any advice or free tutorials or something? This is my model so far, its a full quad geometry.

It looks nice so far.
Why you can not model the stock?
What is the problem?