You need an Arduino and you need a 1602 display.
And you need a power supply.
You need to read and learn a bit.
You can find how to connect a 1602 display to your Arduino right here on the site.
I'm not going to describe that, its dealt with every single day over here so easy to find.
You can make your program by using the IDE, which can be downloaded right away from this site (see the Download button in the top bar ?).
You do not need the hardware to start playing with that.
There's a bunch of examples immediately available after installing the IDE.
You will learn from that.