Thanks Sic and Dale,
The SFX will depend heavily on whether I can get my hand on a portable digital recorder such as the H4n or PMC D50. I can't take other sounds due to copyright reasons so I have to make my own. Im in a good position to get gun sound SFX while Im in the philippines as they have gun ranges with Mg's and Assault rifles. Its something I've been meaning to do but will have to see if I can get the equipment cheap from online. The prices here for that sort of equipment is marked up considerably.