Load up your flight simulator at a location of your choice. This should be parked on the ground (i.e. on an apron or other parking area). Make sure you aren't blocking the taxiways, on the runway, or in the air.
If you connect to an airport with a Ground (GND) or Tower (TWR) controller, they are likely to be able to give you some help if you need it. For your first few flights, it may be advisable to connect to a smaller airport that isn't very busy, so that controllers will have more time to help you if you need it.