Oh boy, where to start...
First of all, you can get a 1911 for the same price, more or less as P99...
You can pick up a 1911 for around 469 to 510...
List price on a P99 is 439.00-ish
9mm is different than .40
Found these on some sort of wacked Japanese website, but hey, it works...thank you Google...
Not too sure what else to tell you...start doing some research. All the info is on the web. Start there become better informed. Then ask some more detailed questions.
Do not buy a gun till you know more.