How, as a man, should I care for my skin?

I have never been taught how I am supposed to care for my skin. In the shower I used to bring down the shampoo from washing my hair. I had really bad acne un high school until I started doing that. It cleared up soon after started.

A friend of mine told me that I have a lot of blackheads on my face. It looks (to me) like just very open pores. They are especially noticeable around my t-zone. I also have a bit of the same thing on my upper arms and back. Same friend also said that on my arms and back I have ingrown hairs. I don't really see what I thought was ingrown hair, a red spot with a tip of hair. Apparently they are just deep down and I have pores that are clogged deep down too, same as on my face.

What am I supposed to be doing to take care of my skin properly as a man?

What can I/should I do about the skin on my back/arms and face?