Practice! Practice! Practice!
I started bowling in May 2013 so just a little over a year ago. When I first started I was like you I could only throw straight and wanted to learn to hook. First thing I did was buy a #12 Ebonite Crush/R and my own shoes. I was lucky if I could bowl 100 and was horrible. My best advice for you now that you have the ball is just practice. A little over a year of bowling and I now throw a #14 DV8 Diva Pearl, have a 161 average and 242 high game in my summer league.
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