Yes you can
no, but you do need a source game like Half Life, Half Life2, or Team Fortress2
No it is not. It requires one of the games in the half life 2 series such as TF2 portal or half life 2.
Gmod is a sandbox game based on the Half Life 2 engine. Unfortunately it is impossible to get rid of the scripted entity limit on Gmod as it is built into the engine.
If you can atleast Run Half Life 2 you can run it.
Yes, and it's fun and free.
No, you do not need to be on the game you bought with Gmod to play it although you do need to have the game installed to run gmod and i also recommend having the game Half-Life 2 installed to get most of the textures and weapons and npcs and props that go along with it.
you can set chat key in options but the deafult is Y key
Gmod is only for the computer. You just install Steam (you can install it buy going to Steam.com) and then there you have it. But you will need a source, so will need to buy either Tam Fortress 2 or Half-Life. Gmod is also 10$.
no you cant but if you buy Half-Life 2 for PC you can get Gmod and mod the game ect.
Put the map in the \maps folder and add the map to the mapcycle.txt.
Press esc and go to save game. It's the same as in half-life. I don't think you can save the game when your online if that's what you want to know.
I'm not sure entirely what you mean by Does gmod work on Counter Strike Source because they are two completely different games. If you mean "Does gmod work with only counter strike source resources?" then Yes. It works with, at the least, any one source game. That includes CS: source, Half Life 2, etc. Yours truly, RJ