man, if you've just started and you're already reaching 450 feet with a 75 foot curve you need to put on the clinics! if by chance you meant feet rather than yards then the good news is you're still well ahead of the learning curve.
it all really comes down to snap and angle at the point of release. the rotation on the disc from more snap will cause the outside edge to come up as will a slightly different angle. the really cool thing about today's plastic is the infinite possibilities from combining those two factors.
first, get a stable disc, one that flies straight with only a bit of curve at the end of it's flight and maybe an understable disc, one that turns over naturally. a right handed back hand fades to the right instead of the left with an understable or "turnover" disc. throw each one 10,000 times and things will start to get much easier.
go to discraft.com and innovadisc.com and check out their descriptions and rating system for the typical flight pattern of each disc.
in general, the thinner the profile and beveled the edge, the more lift it is designed to get. that makes some of the long range drivers a little twitchy in the most experienced hands.
new player's league(s) don't need to be limited to one night or park. if the interest is there from new players the club should be able to come up with another night or two.
women's league has been on thursday's at rosedale, 5;30-6ish. one of the club's officers is tavish sanders, hopefully she'll be okay with me giving out her email address: firstname.lastname@example.org