Steps to create Package

1. Go to T-code SE21
2. Write Package name and click create
3. Write following details

    Description: Give description 
     Software Component: HOME
     Transport Layer: Select Transport layer
     Package TYPE: Development package

4.Then execute and then continue.
5.By this procedure successfully package will be created .

Thanks

Steps to create domain

1. Go to t-code SE11.
2. Select the Domain radio button, enter the name of the domain that you want to create
3. Press create.
4. Enter the short description.
5. Place the cursor in the data type and press F4 to get the list of SAP data types.
6. In the popup window select the correct data type.
7. Enter the number of characters.
8. Enter the decimal places if it applicable to data type that you have selected.
9. Save and activate the domain.

Thanks