if you are going to stay with archery i would recommend buying a fletching tool. I also used hay bales when i started and had numerous pass throughs and missing fletchings. not knowing much i glued them back on by hand..
As far as helical, unless you are using a fall away rest i would shoot straight fletching.
you can buy an Arizona fletching tool for around 40.00. it will pay for itself in the long run, especially when you buy the carbon arrows.
hope this helps