am new to bow hunting and would like to know the pros and cons of straight fletched arrows compared to curved fletch arrows.also with the bow that i have i think that the draw length is a bit to long.i have sited it in and can consistantly hit what i am aimimg at out to 25 metres.is it worth spending money to get it properly set up or is the old addage if it ain't broke don't fix it viable here.

In my experience I always use helical (curved).
The advantage is that it makes the arrow turn in flight. This stabilizes it, much more important when using broadheads. The only advantage to straight fletch is that is easier to clear certain shoot through rests. I must warn you...I am old school. I shoot a heavy arrow, 125 grain points and shoot with a tab. If you shoot a release with a light arrow with expanding heads you may not need helical.

Yes, get your bow set up to your exact draw length or better yet, learn to do it yourself. Welcome to the wonderful world of bowhunting.

A helical fletch is superior to straight or offset. However, it isn't always necessary. Fletching is what controls an arrow in flight. The more helical you have, the higher the rate of spin while in flight. If your bow is not very well tuned, and arrows not well balanced, the helical helps greatly.

If the bow is tuned and arrows in good balance, and you do not intend to shoot a large fixed blade broadhead, straight-offset is fine.

I've shot them all from very well tuned bows, and I prefer the 6 degree helical, low profile 4" vanes.