An Eclipse workspace is just a directory (folder). You have to create it yourself. Create it somewhere that makes sense to you. I suggest making a CS49J folder and putting you workspace in there so it is easy to find.
Double-click on the icon to launch Eclipse. If this is a new installation, you will see a Welcome screen (Fig. 1). Otherwise you will see the Workbench screen (Fig. 2). If you see the Welcome screen, click the "Workbench" button (circled in red).
Fig. 1
The workbench contains lots of helper panels that add clutter. For now you can get
rid of all the panels except the Package Explorer on the left, the large empty
rectangle in the center (this is where your source files will appear), and the Problems pane at the bottom.
Click File -> New -> Java Project on the menu. Caution: create a new Java Project, not a new Project. A wizard will appear. Type a name for the project name, and use defaults for all other settings. When you're finished, the Package Explorer will display your project something like this. Here the project was called hw1_prog (Fig. 3).
Click on the small arrow to the left of the project name to expand the project. Here the project is called lab1project (Fig. 4).
There isn't any code in the project yet so there is not much to see yet.
Click File -> New -> Class on the menu