It sounds funny that Workbench 1.3 is "new" but anyway...
Things are a little different in 1.3 from Workbench 2+ For example, with Workbench there's no way to create a new directory (directories are called "drawers" in Workbench instead of "folders"), so you can either use the CLI to do it (the makedir command), or if you look on the Workbench floppy, there's an empty drawer which you can copy using the menus at the top of the screen.
Menus appear when you hold down the right hand mouse button, and appear at the top of the screen for all applications and windows, sort of how they do in MacOS. However, they disappear again as soon as you let go of the right mouse button, and if the mouse pointer is over an item when you let go of the button, that's the item you selected.
Also, in 1.3 the depth gadgets on the windows are different to 2+ in that there are 2 of them - one to move the window to the front, the other to move it to the back. Windows don't automatically pop to the front when you click on them as they do in other OSes. This is an option in Workbench 2+ but not in 1.3 IIRC.
The RAM disk is handy for temporary storage - it works like a normal disk but you lost the contents as soon as you restart or turn off power. And you may find that many things are easier using the CLI as Workbench 1.3 is quite limited in some areas, so it might help to learn some of the commands... You can open the CLI with the icon in the System drawer on the Workbench disk.