Using a break on a fixed gear road bike or a single speed bike?

theres a lot of hills where i live but i wanna buy a fixed gear road bike as an alternative cos my work to home is close. **How do i slowdown on a hill when Im using a fixed gear road bike with breaks.. can i stop pedalling to slow down or use the break to slowdown? Or how do i slow down at all w/o breaks on a fixie do i skid or stop pedaling the break?