I need to sell my house quickly as I have bought another one and can't afford to make two payments?
Unfortunately in this economy the only way to increase the chance to sell quickly is to list it below market price for your neighborhood. Anything that needs to be repaired should be done prior to showings. I'm sure you know how important staging is & remove all clutter. If baths or kitchen needs updating you will have to take that into consideration in your price.
Make sure your realtor markets your prop considerably & you can also put an open house notice on craigslist.