Need help to create test case for these senorios:

Create test cases to test data entry field Data Entry Req.
Customer Name: 50 characters, alphanumeric, required.
Streed Address: 25 characters, alphanumeric, required.
City: 25 chracters, alphanumeric, required.
State: 2 chracter drop-down box of state codes, required.
Zip: 5 digits numeric, required.

City, State and zip must be a valid combination (database of valid combinations is assumed OK for this test)

Control Button: New - clear fields, place cursor on customer number field (all field enabled)

Question asked by visitor Rani