Stir fry/brown sauce

So recently I got a hankerin for some stir fry and I cooked up some chicken, rice and assorted veggies.  I did the chicken and veggies in a pan with some canola oil and added a bunch of soy sauce.  Came out tasting pretty good but next time I want to up the ante and make some sort of a brown sauce like you might get at a Chinese restaurant.   I picked up some hoisin sauce and wanted to get plum sauce too but couldn't find it.  Anyway I'm going to look it all up on google too but just wondering if anyone has any special tips or suggestions.