Will this camera shoot right away when I press the button?

It's called shutter lag. It's a common problem with point and shoot cameras. It's the delay which happens between triggering the shutter and when the photograph is actually recorded. And what's interesting is, that DSLRs dont' have a lag issue at all. Or, it's nearly non existent.

But there are ways to combat it.

1. Prefocus. Hold down the shutter half way to get a prefocus of the image you're shooting. When it changes, prefocus again. This will speed up your camera's performance during picture taking since it won't have to autofocus before it shoots the shot.

2. Use faster SD cards. Yes, there are faster cards and it does make a difference in writing the image file to the card. This is especially key if you're taking multiple or burst images.

3. Fresher batteries. Use alkalines at least. But I recommend using high energy batteries designed for digital photography. Varta is a good brand. They are usually sold in camera shops, are long lasting (because they are sold in small quantities) put out alot of energy.

4. Pan with the action. You can create some pretty cool shots by panning with your shot, focusing on your subject. This will create the effect of your subject in sharp contrast to the blurry background.

6. Stick with 100-400 ISO. Going higher will cause more noise/grain in your shots, particularly in darker settings.

Doing these, particularly prefocusing and panning with the action will cut your shutter lag by as much as 80%.

But as for this camera - as a DSLR, you won't have to worry about shutter lag. Doesn't exist. But being in the habit of prefocusing still helps cut the focus time down.