Well mate you've started well - now READ, READ, READ!!!! Go to the AFCO and beg to be sent on every acquaint course going, and not just the air ones - you'll learn an awful lot more about the RN. Many aircrew I know found a visit to Faslane and the SSN/SSBN community very interesting, along with MCD and lots of other branches. Keep asking questions and be seen to be keen as mustard and the AFCO will do their best for you - mine were terrific and I met some good people.
Best of luck, go for it - I saw about 20 countries in my first 8 months after Dartmouth!!