The kid just finished his age 19 season. A reasonable jump from the 98 innings he pitched this year would be maybe 120 to130 innings (I'll defer to one of the minor league gurus like RD on this). Maybe an extended spring then pitch May - August and get him up to 25 starts?
by the way, he went 98 innings, 10-2, 2.20 ERA, 110 Ks, 28 BB, WHIP 1.00, 7 HR allowed.