One word of advice I like to give to anyone new to the game is to avoid gamefaqs. Sometimes you'll think to yourself, "Shit why couldn't they just put a platform here so I can reach that door." But some of the solutions are quite cool and you'll probably be glad you figured it out by yourself. I lent the game to all my friends and they all returned it too early because they got stuck somewhere. Their loss I guess.
Another thing to keep in mind is when all else has failed, switch visors. I discovered some of the coolest things just by following that rule. And put up the volume. That's a good rule #2. The observation/discovery part is what made the game so memorable for me. Either that or circle strafing around enemies to blast them in the ass. Just wait 'till you get the fire weapon and start backtracking through Phendrana Drifts.
Good luck with the rest of the game.
edit: The items in the game emit a low humming sound. That's why I said putting up the volume is a good idea (in case u didn't already know.) I wish I had figured that out sooner.