Coaster brakes question

Why do I have to get/do in order to have coaster brakes? Are they part of the hub that comes with the wheel?

Can I have this on a flip flop, so a freewheel cog on the other side? (does that make sense or am I talking rubbish)

I would want to experiment and learn but have the flexibility of going freewheel when/if I want.

One last question please, I've ridden a single speed bike (new Langster Street) and I tried to stop with my legs power but it obviously didn't work, and I have wrongly assumed I am not strong and skilled enough to do it but was it because it didn't have 'coaster brakes' then?

I know that's a street bike and you're meant to use the brakes, but I am curious about coasting brakes and trying to understand what it takes.

You have to buy the hub with a coaster brake. Or a wheel which already has the hub. Yes you can have it on a flippety flop.

Most fixed gear riders don't have coaster brakes, they have built up teh skid powaz over years and years of practice.

Brakeless fixed is fine once you're used to it.

Heres an old long running thread that may be of use Chris.

https://www.lfgss.com/conversations/132604/

I am on the end of the thread.
I have no one near me to ask for a bit of coaching on fixed skidding.
I tried it several times......... after watching youtube vids on how-to........ all i got was a bit of knee pain from direct attempts to slow down brakeless, i did try this with dual brakes on the bike so no safety dramas.
There is a knack to fixed skidding, control of speed via fixed comes with lots of practice and getting used to using the muscles.
I could do low level speed control and light braking, but for serious stoppage i was not able to master it with out direct input from someone that can.
Dual brakes are ace, my knees love it :)
Took me about 50 miles to get roughly used to fixed, around 100 miles i was quite comfy with riding fixed but still using both brakes.
You won't get it overnight, just run fixed with dual brake for now and work up to trying rear brakeless skidding as you get more used to it and stronger.