Most dogs who do flyball are ball obsessive to some degree
One of mine is reluctant to give a ball up outside of flyball, particularly if we have 1 ball and 5 dogs, but at training he loves working for a tuggy.
We break flyball training down into small parts and don't introduce a ball at first but each club will train differently as there are no rules
We sometimes use a clicker to shape ramp/box work to get the turn right as that is probably the hardest part. I know from experience if you don't get a good turn to start with it is very hard to improve later
The main thing is flyball should be fun for you both