Below are links, with brief descriptions, to posts that should be helpful to beginners….
1. What do I need to take my kids backpacking? Pt.1 – This post discusses first things first as far as the general categories and the practicalities and attitudes. Even though it is geared toward backpacking, it is worth reading if you are new to hiking with your family.
2. Clothing and Gear for a Cool Weather Hike – Like the title says, I go over the clothing and gear my oldest son and I took on a day hike. It was actually very mild weather for January, but we hiked to above 5000 feet. And you must have the cold weather gear at that altitude in January.