where can I obtain an interior blueprint of my home's layout?

You want a floor plan, not a blueprint.

Draw your own with a piece of graph paper

cant seem to understand what you want.

if you are referring to the bagua method... then i guess there are books that teaches it. but for me it is not a fengshui method.

then basically, all houses have fengshui - it is just a matter whether the house have a bad fengshui or a good fengshui. so what is fengshui? fengshui is basically the interaction of energies inside and outside the house. these energies are based on calculations based on certain methods that has something to do with door facing degree, time/ period of house (in fengshui 1 period is 20 years, we are now in period #8), and formations/ structures inside and outside the house.

i know it sounds vague, esp if you are not familiar with the fengshui methods. there are books that teaches some of the basics of these methods, esp those written by joey yap or lillian too. but i dont think that there is a book that teaches the advanced methods of these methods. in my experience, only a person who knows like a practitioner or a fengshui master can teach you the advanced uses of the same methods.

it is hard to recommend anything since you dont have any given measurements like door facing or period when the house was first used. different houses have different charts. and the door facing is a bit tricky because the facing is not always the front of the house. it is basically where the most yang come into the house. and there are houses which applying good fengshui is just impossible, so not all houses can be applied with good fengshui.

there is also no website that can guide you what you need to do. am sorry.

my ideas:

- read joey yap's xuan kong flying stars book, i think it is available at amazon.com; the books can teach you the basics of flying stars, which i think will give you an idea of how the method works in relation to what is happening in your life. so with this method, you can manipulate the outcome of your life. the only problem is... how willing are you to make some renovations in your house. bec this method usually dictates how to arrange (not furnitures, but) different rooms inside the house. this method is simple enough, yet this is powerful enough to make your life change significantly.