You do not have to install a DBMS because the training version includes a built-in proprietary database.
Designer is the part of 1C platform that allows you to create applications. To create an infobase and run Designer:
1.Double-click the 1C:Enterprise shortcut.
2. In the 1C:Enterprise Setup dialog box, click Add.
3. In the Add infobase/group dialog box, click Create a new infobase and then click Next.
4. Click the lowest option button "Create an infobase without configuration..." and then click Next.
5. Specify a name for your infobase (any one you like) and then click Next.
6. Click Next until you complete the wizard.
7. Click Designer.