It honestly depends on how much the quality of the epuipment you use matters to you. Your definatly looking at more than 10 grand when you add everything up. If its what you want to do and you feel you can succeed though, the risk is worth it.
Also, keep your eye on local newspapers and craigslist for people selling their equipment for cheap because they need to sell for whatever reason.
For good start equiptment just for speaker will run u about 1800 dollars, as far as dj software it varies