Insurance wise you should be good for the ninja 300... I got insured in 2015 September (19 years old).. for 1650. September 2016 (20 years old) dropped down to 1150.
Brother who is 25 got insured last year (aged 25 at the time) in june 2016 for 1300.
Anything other than the ninja 300 is in a funny insurance bracket... For example, the cbr300r was 2400 for me and the r3 was 1900 (same insurance company, in 2016 when my premium from ninja 300 was 1150.
Congrats on the purchase! Lots of fun to be had soon. Ride Safe.