Welcome to SMF. There are a lot of very friendly & knowledgeable folks here to help you. I urge you to sign up for the free E-course. It will give you the basics, & even if you are an experienced smoker you may learn something new. Then start asking questions. Good luck & glad to have you aboard. Don't forget we all love Qview! Now, if you would, go to the roll call section & introduce yourself, so we can give you a proper welcome.
As for the bird & the tri-tip, it sounds like you have done both before. If you like the tri-tip rare or med. rare it won't take very long. The chicken must be cooked to 165 in the breast and 175 in the thigh. There are a bunch of chicken recipes, just type beer can chicken in the search box & start reading. The tri-tip is such a good cut of meat I wouldn't mess with it much. Maybe a little s&p, and some steak seasoning. Good luck & let us know how it turns out.