I wouldn't worry about bigger arms and abs. What you should concentrate on is eating big and compound lifts (squats, deadlifts, flat bench, bb rows, etc.) I was exactly the same body type as you about 3 years ago. I made a routine that circled around compounds then 1 or 2 isolation lifts. Eat big and lift big and the pounds, ABS, and ARMs will follow suit.

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Deadlift - 405X1
Squat - 325X1
Bench - 225X1

Golf Tee - Anyone who can bench more than they can squat and/or deadlift.