yes, you can use props/characters from all games that are made by valve
there is a plugin for blender that allows you to make propsanother free alternative is to use XSi Mod Tool which is a free version of the professional package with templates of HL weapons
you cant unless you know something i dont actually it is possible to make an underwater base but not in gmod. you can use the hammer editor to make a map then add water to it and take out the water in the parts of the map where you dont want it. if you have css you can map it with that and i thing you can also map it with tf2. there might be other source games which you can map it with but if there are i don't know about them. and once your done making the map you can export it the which ever game you used then play it on gmod. hope this helps!
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yes
yes, you can use props/characters from all games that are made by valve
You can't pick up weapons. The weapon you wish to use must be in your inventory and then you can equip it.
By buying the real game :P. Okay, now to the srs bsns, I wouldn't recommend piracy (especially when this game is $10-$20) but I don't think it's possible if it didn't come with the weapons, you can look around for a copy that already has the weapons unlocked though.
there is a plugin for blender that allows you to make propsanother free alternative is to use XSi Mod Tool which is a free version of the professional package with templates of HL weapons
I think you can use portal in gmod 10, but I'm not so sure.
you cant unless you know something i dont actually it is possible to make an underwater base but not in gmod. you can use the hammer editor to make a map then add water to it and take out the water in the parts of the map where you dont want it. if you have css you can map it with that and i thing you can also map it with tf2. there might be other source games which you can map it with but if there are i don't know about them. and once your done making the map you can export it the which ever game you used then play it on gmod. hope this helps!
Yes, you must.
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If you cant see weapons, that usually means you don't have the game or download that the weapons are from. Same thing for objects. A common pack that most pple use is phx Here's a download from http://www.garrysmod.org/downloads/?a=view&id=2339 for phx3
If you want to make models for gmod look at XSI Mod Tool.
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yes