Ok, fair enough. But anyway, it has always been a paid service. A MyMulti will be beneficial if you go more than 2-3 days a week.
Well for example, if you have a lecture at lower campus, you don't really want a tutorial at upper campus. Or if you have two tutorials in a row, you would want them to be nearby.
Of course if it's impossible to structure it in a better way, then it's impossible, but you are given some decent options.
The class location will be listed alongside the class times. For example, MATH1131:
http://www.timetable.unsw.edu.au/current/MATH1131.html (scroll down for the times and classes)
This is just something to consider if you don't like walking up the Basser Stairs.
It should look like this in the top left hand corner (excluding the Staff tab). If not, just wait until 9pm.
Kind of hard to explain what it's like - it undoubtedly requires you to enjoy the courses, otherwise it would be really dry and rather boring. Because it covers a fairly wide range of areas, such as from mechanics of solids to thermodynamics to statistics etc., it does require you to have that wide range of interests.
Maybe look at what career you could see yourself going into, then work back to decide on which engineering stream. The traditional streams are all rather different, so maybe look at the Handbooks for the streams, look at the courses you would have to take and decide whether they interest you.