Hello Shahoff!
You can find the AMOS Professional archives (v1.0, v1.12 update, and v2.0 update) in the AMOS Factory / Development section of this web site. These arechives contain .adf files that you can use to install AMOS in an emulator or you can use the adf2disk tool from Aminet to write the disk files to real floppy disks for installation on a real Amiga. Start with v1.0, install it, then install the 1.12 update followed by the 2.0 update.
There is a link to the AMOS Pro manual on the front page of the AMOS Factory. It also has installation instructions and details of all the commands in AMOS.
But once you have AMOS installed, just start the program by clicking on the icon and the editor will start. Type in "Print "The world is HELL :-)" and then click on the play button at the top of the editor screen. If everything went correctly you should see the message printed in white on an orange background.