My best advice to you is: don’t.
I got a PhD in mathematics in 1962 and was immediately offerred a 2 year limited instructorship at Columbia. Two years later I was offerred several jobs (including one that totally unsolicited) and took one. Three years and three or four (pretty good) papers later, I was a tenured associate professor. My career then took a slightly different turn, but by 1972 I was a full professor and stayed that way till I retired.
At the beginning of my career, I did my teaching, published by research (in journals, publishing books rarely gets you much credit in math) and ducked committee work (I was advised to do so). I cannot say I worked that hard, although in a certain sense I was working all the time since I was obsessed by my research and thought about it all the time.
Nowadays, it is all different. A person might spend several years as a postdoc, doing some teaching and lots of research. At the end of that time, if he has a lot of publications he might send out 500 applications and, if he is very good or very lucky, get one offer at Podunk U. So he goes there and finds that he has a large teaching load, is expected to continue his research and, to have any chance of tenure, must do a fair amount of committee work (mostly bullshit, IMHO). He must maintain a career dossier that includes all his teaching evaluations, all his papers, and documenting his committee work. Sometime in his sixth years, he will be evaluated for tenure. Letters will be solicited about his reearch and they will go over his teaching evaluations with a fine tooth comb and maybe, just maybe, they will grant him tenure. If not, he will get a one year terminal appointment during which he can look for another job (Ha!, he will probably become a programmer–at least if there are programming jobs).
The worst part of this is the teaching evaluations. Yes, there are good teachers and terrible teachers, but except for the latter, the students are not in a position to judge. When I started out, there were no teaching evaluations. Then they were voluntary, then obligatory. But I quickly discovered that the main thing that correlated with my evaluations was the difficulty of the midterm exam. Easy midterm = good evaluations, hard midterm = bad evaluations. So I adjusted by giving easy midterms and hard finals. Wonderful, the students trapped into thinking that this course was going to be easy and then blindsided by the final (which came after the evaluation). I think that these evaluations are the #1 reason for grade inflation. But that is another topic.
When I began, professors had a degree of autonomy. It was considered that the professors were the university and the administrators were employees that they hired to do some of the scut work. What always happens in such situations, though, is that the administrators became the real exceutives and the professors have become their employees. Just as one example, it used to be in my school that we had complete autonomy to admit graduate students. This meant occasionally admitting one who for one reason or another did not have the equivalent of our bachelor’s degree. Now secretaries in the grad school office regularly turn down our choices because they don’t meet their standards. Usually because they have too low a CGPA (“But they have straight A’s in math.” “Doesn’t matter; we have to maintain standards.”)
Why anyone would put themselves through this is beyond me.