When you haven't bowled for a while, especially if you were bowling in the "old style", the most important thing to work on again, rebuild from scratch is timing, timing, and timing. Did I mention timing?
And, if you're going to rebuild yourself, get your address right (bent knees, balanced arm supporting the ball, bent slightly so your head is over the ball). Make sure your pushaway is right to give you the correct timing with your natural approach, and take that crossover step to get out of the way of that downswing.
Each is a process unto itself, but if you get all those right you'll be 9/10ths to great fundamentals.
A lot of good videos and instructions out there, and good coaching too.
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