I'm fairly new to smokers. I just bought my first one from Lowes. I bought the 30" Masterbuilt Electric Smokehouse. Here are some questions: - I'm really not sure how to use the air vent? Should it only be shut when I am using wood? When should I open it? - For the wood - what size wood do you use? Some of the wood looks like it might be to big to put into the chamber? - How often do I need to put more wood into the chamber? - Is there any problem opening up the door in the middle of smoking to check the temp of the meat? - What is the best way to test the temp of meat - a prob? What is the best one to buy? I appreciate your help.