Watch it with squats. Start with leg extensions and low weight on presses. If you aren't using a machine for squats, it's easy to hurt yourself using a bar. I tweaked my knee a couple of years ago doing squats with a bar. I just use a squat machine now, since I don't want to risk messing up my knee again.
yeah sad thing is i'm not really using heavy weights, just dumbells, like 15 pounders, haha... i just haven't done them in so long, and my one leg is atrophied after my knee injury...
but yeah i have to take it easy lol
i did some super low weight extensions too, my knee goes CLICK CLICK CLICKETY CLICK CLICK it's scary!!!
You might want to just stick to a stationary bike for now. My knee does that too, but I can't hear it unless my ear is right up against it. I'm sure one day I'll have to be scoped.