ah, good question...
Use some of that money and buy a whole lotta magazines. Then look through them quickly and casually, only stopping to really inspect when the overall look of a room catches your eye.
Then, tear out or mark up all those layouts that you are attracted to, spread 'em out, and decide what appeals to YOU. Is it the color scheme? The simple or detailed lines of the furniture? The light streaming in the windows? The plushness of everything? The 'certain' over-all feeling of the room?
Then, visit an upscale furniture store and take a walk through the set ups they have to display their wares. Take mental notes and/or photographs of what you instantly like. Don't question yourself, or wonder if it's the current style. Sit in chairs, sprawl on sofas, lean against headboards and keep making those mental notes. Visit a furniture consignment shop in your area if possible.
Now, start with a room and buy one of the bigger pieces you'll need, such as the bed or sofa and take your time to get EXACTly what you love. Live with it a day or a week, and search once more for another piece to add to that room and live with those pieces, too.
Add onto the room, piece by piece, color by color, style by style, slowly, until you have the right number of colors/pieces/comfort you feel makes it ALL yours. And remember, eclectic style is, and always will be, supreme.
Don't forget the floors, or the wall color (I suggest neutrals), and Art upon the walls. Invite your friends and suggest that you'd love an addition of a hand picked or hand-made item from your favorite people. It doesn't have to be expensive -- a shell from the beach where you had a class reunion, for example. Or a plant someone potted just for you. Or, have an Art party where you buy a blank canvas and jars of paint in "your" colors and invite everyone to contribute to your first piece of Art! Couple of bottles of wine and we're ALL artists, right?!
Now, you've created a well-designed by YOU place that you've invested time and love into, that will feel like home forever to you and your loved ones.
Last detail? Take the money you would've spent on some designer's "Professional" taste in home and comfort, and buy a fabulous piece OR have a party OR both!