You lost me with 2 things: 1lb, and 4 strips. I have no idea what you have, but that's not a tri-tip...unless, maybe, someone got over anxious with a knife and cut up a tri-tip into single portion sizes, then placed it into 2 or 3 packages. Tri-tips are a single roast, generally weighing 2-3lbs.
Anyway, strips will cook like a steak or chop...smoke low & slow @ 225* to your desired internal temp (approx ~1 hr). Cherry, hickory and any other stronger smoke woods will do it justice. Milder woods are fine as well, but beef can take the strong stuff. Keep seasoning simple, as beef in general, and especially tri-tip (if that's what it is) don't need much coaxing to bring out great flavor. SPOG (Salt, Pepper, Onion, Garlic) is a good starting point.
Eric