Hi abz217,
Most of what you're looking for is in this thread somewhere - just search for Stage 1 or personality and you should find a load of stuff. The personality test comes after the Stage 1 tests (if you pass) - it's a multi choice thing similar to a Myers-Briggs test (google it for examples). I think there's a link for the Stage 1 document somewhere on here too.
The plane info is contained in the document for Stage 1 - for this stage, they just expect you to learn what's in there (ie. you don't have to have any prior knowledge of planes, etc).
Hope this helps...When are you planning on applying?