Kim,
Please get some professional help with this - it will make the WORLD of difference.
If you visit electrical wholesalers, you'll often find they'll do this for free as part of helping you choose their light fittings.
Beacon Lighting will charge $100 to do it, and that's redeemable against any of their products.
Bright Green (an Australian LED company) have a service to let you do it online.
And if you google "free lighting plan service" you'll see a myriad of alternatives.
It's a tricky thing to get lighting right - and something that's so frustrating to stuff up, because retrofit is expensive (or you need to where shades inside at night).
If you listen to my new podcast episode on Tuesday, I've got a fantastic podcast partner who does customisable LED strip lighting, in Australia, and they have a special offer for my podcast listeners. Head to the website, look for 'podcast' on the top menu, and you'll see it there. They're sponsoring Season 3 (which starts Tuesday).
Best wishes
Amelia, UA
www.undercoverarchitect.com
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note sure i want this in my house but love the colour of tiles and the marble
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