Hello.
I currently have exactly the same camera model. Bouncing the flash will result in underexposure because the camera exposure system won't account for the effective attenuation of light and it's power level can't be manually overridden. I simply don't rely on the onboard flash.
Some suggestions for studio-like setup: Given you have a tripod disable image stabilization, use the timer and hand hold a desk lamp (Or several) with each arm or even legs/chest whatever is need. Optionally, fasten light bulbs to the back of a chair, or a broom shaft and then to the chair if you want otherwise not possible lighting angles. White boards can be used as reflectors or bouncers, especially[/I] in conjunction with desk lamps; even paper sheets are useful for this purpose. Don't be afraid to use long shutter times if need to shoot at ISO 64. Manual mode is useful in this setup. Don't rely on the live view exposure simulation (There is no exposure simulation in manual mode), check the actual pictures (Zoom with the zoom lever and see clipped highlights and metadata with +/-). However don't obsess with the inherent technical drawbacks (My lens is noticeably unsharp in the left side of image). Use
The GIMP for distortion correction and other editing. It's free as free beer but more importantly
free as in freedom.
Make yourself familiar with your equipment limitations and the effects of different settings. Play with the distinct settings until you're familiar with them. We could give more specific advice for a specific situation.
Bear in mind the camera is just the tool. No amount of expensive equipment will magically make great pictures. Here is an essay on the subject:
http://www.kenrockwell.com/tech/notcamera.htm.
Good luck!.