Also recognize that there are other options to help indoor/low light shots than just flash. Basically the issue is that there isn't a lot of light indoors, especially at night. By going with a flash, you are choosing to raise the amount of light in the room, but also recognize that it will be a lot of learning and take some skill to make flash photos look natural.
The other option is to try to make due with the amount of light already available. This can be done by getting a lens that will let more light get to the sensor. I don't know what lens you are using, but I am guessing it is the 18-55mm that usually comes with the camera. The thing about the 18-55mm is that its aperture range is f/3.5-5.6. This means with the zoom set to the widest at 18mm, you have a maximum aperture setting of f/3.5. When you zoom in to 55mm, your maximum aperture is even smaller at f/5.6. The higher the aperture number, the smaller the aperture opening is, the less light can get to the sensor.
Now if you get a prime lens like the 35mm f/1.8G, the aperture is 4x bigger than f/3.5 and ~10x bigger than f/5.6. This means 4x and ~10x more light to the sensor with this lens than your 18-55mm lens.
So consider that you have other options than just getting a flash. I find flash to be too obtrusive to use comfortably in most situations.
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