I really recommend you doing deads every time you do squats,specially since you just starting,might as well maximize your gains on lower body days,wats 3 sets of 8-12 reps gonna cost you?bout 20mins
Delayed onset muscle soreness (
DOMS), also called
muscle fever, is the
pain and stiffness felt in
muscles several hours to days after unaccustomed or strenuous
exercise.
The soreness is felt most strongly 24 to 72 hours after the exercise.
[1][2]:63 It is thought to be caused by
eccentric(lengthening) exercise, which causes
microtrauma to the
muscle fibers. After such exercise, the muscle adapts rapidly to prevent muscle damage, and thereby soreness,if exercise is repeated