門口 in Japanese is "門口" (also pronounced as "monkuchi"). However, it typically refers to the entrance or gate area, and depending on context, it could be used as 入口 (iriguchi) for entrance.
招牌 is already in Japanese. It translates as "signboard" or "shop sign". If you are looking for a specific context or use, please let me know!
店内
外帶 in Japanese is translated as "テイクアウト" (teikuauto).