What type of housing is best for my chickens?
Buying priorities for a coop are to choose good quality and the best that you can afford, which is easy to clean and maintain. Wooden housing can harbour red mites, so a plastic coop that can be dismantled for cleaning will be helpful. If you really prefer a wooden coop, then either get one that has a removable roof, or one that is large enough for you to stand up in, to enable easy and effective cleaning.
You will also need to consider a run for your chickens to get some fresh air, and this should be made from weldmesh, which is secure from predators and covered with a clear waterproof roof to keep them dry.