The best advice i was given while on the train to pirbright was when you get to the station , give your service number in two groups of 4. Try get your Cat B driving licence before you start training, this will just help you move about easier in the early days you will have alot kit, also when you get to Phase 2 and 3 training you will be fast tracked to HGV etc. driving cost money so you will be hanging around waiting for it easier if you do it yourself be proactive. Fitness is a big part of army life so goto the Gym do some sort of basic rountine even if its walking around the block get the pulse rate going, Again it will just make service life so much easier if you fit.