Teenyweeny ATC Cdt Cpl, your interest in Flight Test is to be applauded - I think as an outsider it can seem a daunting world to get involved in as formal qualifications are hard to come by (and v. expensive). However, in my experience, a basic knowledge of aircraft and their operation, combined with a good dollop of natural enthusiasm are a very good starting point. Sounds to me like you're heading in the right direction.
I would recommend addressing any correspondance direct to the Flight Test Dept - this will target a response from the area you are really interested in and not just get a form letter back from Human Remains. Any of the organisations Ghengis has suggested all have their own merits, depends on your location really.
Good Luck.
PS When I did my PPL, Ex 14 was first solo, so I guess you are having to wait for the big One Seven.