Creating and testing Sandbox

For Trial version, just create your login credentials using the below link

https://www.salesforce.com/form/signup/freetrial-force-form.jsp?d=70130000000G3R3

Creating Sandbox:

1. Go to Setup --> Administration Setup --> Sandbox.

2. Click 'New Sandbox' Button.

3. Enter the Name, Description and select the type of sandbox and click 'Start Copy' button.

Testing Sandbox:

1. Login into 'https://test.salesforce.com'.

Your users can log in from 'https://test.salesforce.com' by appending ".test" to their salesforce.com user logins. For example, if your login in your production account is user@company.domain, then your login for this sandbox is user@company.domain.test.

Cheers!!!