Where should I start with pore care?

My pores are particularly large and bumpy on my nose and the cheeks around it, but honestly, I don't know anything about it, so I've practically been neglecting it.

What do you start with when you take care of yourself?

Looking at the posts, it seems like there is a lot of talk about cleansing. If I rub my face thoroughly when cleansing, does the sebum inside the pores come out?

Wouldn't the pores look bigger after the sebum comes out?

I use foundation, and I apply it to the point where I practically block out the pores. I'm worried that if the pores don't shrink immediately after removing the sebum, the foundation and other products will eventually just accumulate as sebum again.

I am curious to know in what order you all effectively manage your pores.