Advice on taking care of long-ish hair?

So my hair’s been growing for a while, and now I’m having some issues.

Firstly, how do you people with longish hair manage to wash it all? Before, when my hair was super short, I just sort of lathered up a tonne and smeared it around…how do you handle longer hair? Do you have to take more showers or fewer or about the same amount to control grease/dirt in your hair?

Secondly, when your hair is growing after having been shorter, do you notice more hair falling out? (Or is this an illusion, helped by the fact that my hair is much longer than it used to be?) I have about half as much hair as I used to.

Thirdly, do you brush or comb it, and why? Do you put it up or leave it down?

Any advice would be great…no one in my family has long hair anymore. Thanks!