This is everything that you would, ideally, like your finished project to include. For example, even if your main objective is to update the kitchen and add a family room, you may also wish to replace all your existing windows and enlarge your deck. Include everything, even if you suspect it may not be feasible. This will help to ensure that you don't forego something unnecessarily. For instance, you might be hesitant to add a fireplace to your wish list, fearing that the prohibitive cost of a masonry fireplace would place it outside the constraints of your project's budget.
Magazines are a great resource and there are a huge variety from which to choose.
It's much easier to illustrate your likes and dislikes with photographs than to convey your vision with words alone or to describe something you saw three months ago. Look, touch, ask questions. Compare features, prices, lead times, options and quality. Educate yourself about the products you'll need to select for your home. Attend a home show.