sal of salmar productions (10/20/2011)
Stuckon3d has made some wonderful FREE video tutorials that will help you with the basics in many areas but also with building construction and construction with primitives (Iclone 3d blocks / Props) so start with :
https://forum.reallusion.com/Topic31003-33-1.aspx
As far as weapons and materials - you can constructed them from Iclone prematives (3d blocks /props) or you can get them from 3d exchange and google warehouse where you can choose hundreds of thousand props/weapon or most what ever you can think of from there - which I would recommend - you should be able to find out more about that at :
http://www.reallusion.com/reallusiontv/3dx/tutorial.asp
The basic tutorials will answer many of your questions concerning building items and or where to get them....as well as some necessary basic information......above all have fun......
Others in the forum may point you in better directions then I - So check out the videos and check back on this string for some real expert advise........................And - Mark has an excellent Video Tutorial for constructing, texturing & populating a room, using just the walls etc supplied with iC4 (Anyway) Props. I'll see if I can add a Link to it, in my Post here.
ADDED - Link; http://www.youtube.com/watch?v=J0GQXwKXvMc&feature=player_embedded
BTW - The Textures & population "Props" he used, are Free from CGTextures (Link to be added).