A higher frame rate...say 60fps (frames per second) would be helpful for a smoother play back in slow motion. This will make it easier to analyze your swing.
Manual control over the shutter speed too. By increasing the shutter speed you'll be able to get a "Strobe" like effect and see your swing without it being motion blurred. Most auto settings on camcorders end up keeping the video around a 1/60th shutter speed. You'll wand to experiment with numbers faster than that.

This camcorder uses memory cards. Any SDHC card should work fine.

The time and date stamp is usually done through the printing process or at the photo shop that does the prints for you. The information is encoded in the image and retrieved when printed.

You will need to change some settings on the camera.
First put the camera in "P" mode with the dial on the top.
Second change the metering setting to "Spot". This will allow you to put the dot inside the viewfinder on the exact spot you want to sample the lighting to set the camera.
Now set the ISO of the camera to 200. This might increase to 400(or more) if the room is too dark.
The next part takes some imagination. Ignoring the Black Backdrop, you have to imagine the kids in black and white. Now with the brightest part of the kids being the high end and the darkest, not counting the black behind them, as the low end, put the dot in the viewfinder on what you would consider the middle brightness and press the shutter button half way and keep it pressed.
Now point the camera keeping the shutter button half pressed to compose the shot. When ready push the button the rest of the way to take the picture. If it comes out too dark or blurry change the ISO to 400 up to 800.
Try to avoid using the flash.
Good Luck.