For installations according to US and similar wiring codes: the level as other light switches in the rest of your house and next to the door opening.
For installations according to UK wiring regulations: it is not permitted to position a normal shoulder-height light switch inside a bathroom.
A switch for the light(s) in a bathroom, shower room or toilet can be positioned either 1) OUTSIDE the room at the level of other light switches in the rest of your house, next to the room's door opening, or 2) as a pull-switch mounted on the ceiling INSIDE the room, just inside the door opening.
However, since the latest UK wiring regulations were issued, only a qualified and Licensed Electrician is allowed to install or modify electrical wiring in a bathroom, cloakroom/toilet, kitchen or any other kind of room where water taps ("faucets" in US parlance) sinks, baths, showers, etc. are installed.
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The height is usually based on the type of mirror that is to be installed above the sink. Take the height of the sink plus the height of the mirror and add 6 inches to find the center for the placement of the fixture junction box. If there is to be a space between the sink and the mirror add that measurement in to factoring of the height.
A triplex outlet. It is a simple device unless one or more of these switches are "3way" switches.
You should first remove your old bathroom light fixtures and then very careful screw in the new bathroom light fixtures. It is a good idea to have the electricity off so you don't hurt yourself.
You would need to purchase a duplex switch. As for the pilot light look for a duplex switch that has a neon pilot light that is incorporated into the handle of the switch. When the switch is turned on the switch's handle will illuminate.
The use of a four way switch is needed when a load (such as a light) needs to be controlled from 3 locations or more. For instance when you walk down a hallway and there is a light there are probably at least two switches one at the beginning of the hallway and one at the end. These two switches will turn the light on or off from either location. These two switches will be three way switches. When the need to control a light or a load from more that two locations arises a four way switch is introduced. A light or load can be controlled an unlimited amount of locations by adding four way switches which are wired in between the two three way switches. Think of a sandwich where the three way switches are the bread and the meat and veggies are the four way switches. You can put as much meat and veggies as you want, but you always need two slices of bread on the top and bottom.