Drawing a good set of custom home plans involves integrating many different concepts and ideas into a solid and usable working plan. Many designers are able to come up with a unique or interesting preliminary design, but fail to deliver when its time to detail the house structure. They draw a pretty picture but have little or no understanding of how to translate that nice design into a working plan which the builder can understand.
Having been in the business for more than 30 years, we have seen a large number of house plans which looked good at first glance. However, upon closer examination, many of these plans were found to be lacking large amounts of needed information. If a house plan is not easy to navigate or is not thoroughly detailed, then the builder is left to guess at the designer's intentions. This often means that he will "pad" his bid to make sure that he covers any unknown construction costs that may arise.
There are dozens of other house plan style categories, such as A-Frames, Mission, Contemporary, Southwest, and Tudor to name just a few. A web search for house plans yields a mind blowing number of searchable sites. Most of these allow you to search for house plans, by style, number of bedrooms, baths, with or without a garage, or by sq. ft. of living space.
There are a few aspects that you must finalize in your mind, before looking at the different online designs. You need to visualize the structure of the house with respect to whether there should be a basement, how many storeys you would like to have, the number of garages that you want, whether you wish to have any outside water pond, the size of the house, the sizes of the different bedrooms, kitchen, living area, etc., and the amenities that you want like bathroom tubs, sinks, and fireplace.