There are several places you can jack up the Z.
The owner's manual will show you two places on the pinch weld with notches designed for the supplied jack. Use that only in an emergency and if you don't have a real floor jack.
The service manual will show you a few more places. Here's where you can download the complete service manual. There may be a link for 2010 as well.
2009 370z Service Manual Complete ready to Download!
In general, anywhere adjacent to the inside of the pinch weld is a load bearing point. I use these spots to lift the car up one side at a time. Other common areas people use include the rear diff ("pumpkin"), or rear suspension arm (where the springs are perched). Of course, watch out for the sideskirt, exhaust components, etc. while you lift up/lower the car. In theory you can rest the car on the pinch welds, but do not use the pinch weld (seat of jack directly on the pinch weld) to jack the car up. Get yourself some pinch weld adapters for your stands and your jack. The adapters make contact on either side of the weld. A hockey puck with a 1/4" slit cut down the middle works well as a poor man's pinch weld adapter. I use hockey pucks myself.
There are several threads that talk about "jacking points" and "jack stands" on the forum if you need more information. If you're not familiar with lifting a car up, be cautious the first couple of times until you familiarize yourself with the underside of the car and the equipment you are using. Please make sure the car is securely placed before you crawl underneath, and NEVER get underneath a vehicle with only a jack supporting it. USE JACK STANDS.
For certain DIY's such as an oil change, you can simply place your car up on ramps. If you need ramps, consider Race Ramps. There's a vendor here (Reverse Logic) that sells them. Fred's a good guy and they have ramps and flatstoppers that are quite handy to have.
NEW from Race Ramps - Two-Piece, Two-Stage Incline Race Ramps