To get in a seat/car in garrys mod you must press your use key next to it (default is E). If you do not know what your use key is go to options and check in keyboard.
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You have to build one.
no because garrys mod requires that you have a game that uses the source engine
gmod is 10$ at garrysmod.com
No. it is PC only.
gmod is for PC only