Dan_fash,
Before your next cook you really should do some research and watch some videos on how to run an offset smoker. Choking off the heat source is the worst thing you can do as it's going to put out your fire and leave the wood to smolder, rather than burn. You're going to be get a ton of billowing, thick, ashy, white smoke and it's going to leave a bitter and ash flavor on your meat.
For the time being use dry chunks and fully whitened over charcoal, but for your next cook you'll really want to source some proper wood splits. The biggest thing to remember in an offset smoker is that airflow is the most important thing... better to chase a clean burning fire than a perfect temperature. Once you get the hang of cooking with wood splits it will become very easy to adjust your temperature by the size of the wood split you're putting on the fire.
I'm leaving this video here because this guy explains the airflow very well and he gives some very good insight into how to run a clean fire in an offset smoker.
How to Manage Your Smoker Fire - YouTube
Also here's another video from T-Roy cooks which is good as well.
Offset Smoker Fire Management - How To Video - YouTube