My best recommendation is to use a reliable meat probe thermometer to insure the entire bird is done. Recommended internal temps for poultry is *165.
It's been my experience that, when smoking whole, intact chickens, it's a challenge to get the white meat and the dark meat both done at the same time. I find that the breast will be done before the thighs...so that by the time the thighs reach *165, the breast meat is overcooked and dry.
IMO, like many of the others who are giving you good advice, the best way to get a chicken to cook evenly is to spatchcock it (sometimes called butterflying). And as others have said, you can smoke poultry hot and fast, at *300 or higher. If you like the skin to be crispy, that's the way to get it.
Seasonings are, of course, a personal preference thing. I like to get a light coat of SPG (salt pepper garlic) seasoning under the skin...then slather a mixture of butter, minced garlic, and poultry seasoning on the outside as it cooks. Be careful with the salt - it's pretty easy to oversalt chicken IMO.
Good luck - and be sure to let us know how yours turns out!
Red