Just do west side for skinny bastards, or abbh2 or some other program which is good for beginners.
IF you don't choose to do that, depending on what youre doing you need to hit legs at least twice-3 times. Not necessarily squatting, but at least hit your legs.
You said you do total body 3 times a week. One day go heavy squatting and medium weight pullthoughs, take it easy on upper body. The next day do lunches or some other unilateral movement in the 8-12 range followed by heavier rdls, the next workout do light weight stuff in the 10-15 range, or dynamic work. Do leg curls and then go heavy on upperbody this day.
Have one medium, one heavy, one light day for upper/lower body. On the heavy day for one go light on the other, and have a higher volume lighter weight day in the middle so you aren't raping your recovery.