Here's some general notes regarding flying your remote rc helicopter indoors:

First and formost, never run or operate a fuel (e.g., gas or nitro) powered helicopter indoors. Internal combustion engines emit carbon monoxide which causes asphyxiation.

Now that the lawyers are happy, lets talk indoors. Indoor helicopter operation is generally reserved to small scale models. You'll want to keep the room clear, as even small helicopters can do damage should the rotor blades come into contact with anything. Or, as in my case, the helicopters can scatter and rearrange your important papers.

Mark an area slightly larger than the landing skids of the rc helicopter. Consider a sheet of plywood as a pad. This is particularly important with smaller remote rc helicopters as grass can interfere with operation and tangle in the skids/landing gear.

Clear the area. The least obstructions the better. The fewer distractions the better. Plus, the main rotors can do some damage if they come in contact with anything.

Some general notes on hovering outdoors.
The wind can be a major factor in the behavior of your model RC helicopter.

First and formost, a small, lightweight rc helicopter, especially fixed-pitched models can be swept away in the wind. If it's a windy day, reconsider your practice session.

When I was young and it was time to learn to ride a two-wheeler, my elder brothers told me that I really didn't need training wheels and that they would hold me back. They were right.

When it comes to training gear for radio controlled Helicopters, however, USE TRAINING GEAR. It adds stability and lowers the center of gravity. They are worth every penny one would spend for them. The important thing is, like training wheels on your bicycle, they can hold you back so lose them as soon as you're comfortable.