Snafu- If you are in the USA, you may want to consider using mode 2, as that is what is typicaly used. Most, if not all, radios you buy here are set up mode 2 at the factory, (there is usually a way of switching that later). The other reason to be familiar with mode 2 is if a friend lets you fly their plane, chances are they will be set up that way.
Which ever way you go, the throttle is the one without the spring.
Of course it's up to you. There is no "right way", but it's easier to go with the flow here. Just my opinion.
-Brad