Is it okay to give students advice on managing academic work?
It's totally appropriate especially for first year students. Learning college level study skills is one of the crucial tasks of the first year.  Additionally, many students whose parents did not attend college (and even some who do have such parents) are totally unaware that they can do things such as attend office hours or email the professor if they need an extension or have a problem.  In fact the way you have structured this, you could even in the future think of developing such knowledge as a learning outcome.