Hi Whitelighter,
dont bother with a tower visit at this stage you dont need to do that until after stage 2.
The ATC sim game is good fun, ive played it for ages but again it wont really help you at this stage, more like a distraction to be honest but fun none the less.
The Tiscali web page is dead so dont bother looking for it anymore, I did and spent ages pm - ing people and eventually found out it isnt hosted anymore.
This thread is your best place for advice, I printed the whole thing and had a good read!
Check your PM for some links to other useful stuff, and I also bought a book called 'Mechanical and spatial apptitude' from amazon and 'Air traffic control career prep' which has got some good DST stuff and comes with a handy cd which is good practice.
Best of luck!