Step 1: Area overview
Step 2: Palette
Step 3: Scripting area
Step 4: Stage and sprite areas
In the area below that, you can paint or import a new sprite, or, if you need inspiration, just import a random sprite! You can select a sprite to work on and view its name. You can do basic actions to it in the contextual menu (what you get if you right-click). To view the number of scripts it has, mouse over it for a moment.
*For example, if you captured the area in the note around the cat, you'd just get the cat, not the white around it. This can be useful but sometimes very annoying.
Step 5: Menus
The image notes speak for themselves, but here we go anyway. in the far upper right corner, you have the option of viewing your project in presentation mode, small stage mode, or large stage mode. Presentation mode is good for showing your project to people (e.g. projected at an exposition). However, at time of publication, you cannot run this off the internet, so you must have the project and Scratch on your computer to do this. Small stage is good for coding so you have lots of space to work with and large stage is the normal mode.
In the top middle is the toolbar. Holding down shift while using any of these keeps them active instead of just going back to the cursor tool when you click and it does its stuff. The first is for duplicating, the second is for deleting, the third enlarging, and the fourth is for shrinking. they all work for sprites and the first two also work for scripts.
I will now attempt to go over the menus. everything that it is obvious what does I will not mention. The first three buttons let you choose your language, and save (cmd-S or ctrl-S works here, too) or upload your project to scratch.mit.edu. In the File menu, the only thing of interest is Project Notes... This lets you edit your project notes. When uploaded to the site, these will appear to the right and slightly down from the top of your project. Warning: most people don't always read these, so it's best to put instructions in-game. The Edit menu is very interesting. Undelete (cmd-Z and ctrl-Z, folks!) ONLY undeletes the last script you deleted. IT WILL NOT UNDO ANYTHING ELSE! Single stepping just flashes the block it's on at the moment and goes one block at a time. Very slow, but useful for finding out what's going wrong. In Set Single Stepping... you can choose to go in turbo speed (obvious what this is), normal, flash blocks fast (like single stepping only faster), or flash blocks slow (normal single stepping). The Show Motor Blocks command is for use with Lego WeDo, which is compatible with Scratch. I don't own any, so I cant explain them. Almost done! Help Page... and Help Screens... take you to the help on the website. About Scratch... shows info about this version in a popup.
Step 6: Wrapping up
...and they all lived happily ever after.
...(It wasn't a Thursday.)