How to Install Postgres & create db on Unix

I have to install Postgres and create a small db on a unix box, however i'm a novice to both Unix cmds and postgres. My background is sql servers 2005-2012.

So any help or help to documentation in the right direction would help me out greatly.

-Are there any step by step documentation how to set a Postgres db on a unix box?

- any videos showing these steps?
- or can someone srite out the steps I need to step to achieve this task of installing and creating a postgres db?


Thanks in advance