I need some advice

So. I have a team and I want to take them through a path in the jungle where there are traps and enemies waiting to ambush them, but... how do I do it? The only context my team has is that "a hostile organization may operate in the area", should I just release them into the jungle without giving them a clue, should I give them clues that "there may be traps and ambushes"? If so, should they roll Perception every time they move to see if there are new traps or is just one roll per area fine? heeeeeeelp pls thanks