I have three bits of advice for newbies:-
1) invest in a decent set of headsets and get away as quickly as you can from using the tired old club sets that deform your head and leave you with sore ears.
2) try to negotiate a CRP5 if you purchase a starter pack cos if you go commercial then you will end up throwing away the trusty old CRP1
3) make your instructor teach you the wind down method for wind velocity calcuations. If you end up going commercial then you will find this is the only reliable method.
PS: I just checked out the Argos website and that NAV bag looks quite nifty for £20. Cheers Broomstick.