Platinum Arts Sandbox - Free 3D Game Maker Forum

I want to create a game. Big size maps. FPS/TPS. Guns. Dedicated server. I wanna progress on having fun making the game, not have to learn hard language. Possible to find resources. Import models like these: http://www.dexsoft-games.com/models/index.html etc.

Is it possible here?

For every engine you'll feed coding language, this program let you build maps very easily without coding, but for the shooting part you need codes.
Because you want to make a fps game with guns, I recommend you to try this engine instead: http://sauerbraten.org/ , it works the same, but has guns in it, Platinum Arts Sandbox is based on this engine, so if you can handle this engine, you can handle Sauerbraten too.

Hope this answers your question

but aint that just a game=

no, it's also a game creator like Sandbox. In a sense, it's PAS's older brother.