Q: how to find out software from apple store

What do mean by 'don't have open a apple store' ? What problem are you having ? As you've posted on here then you have an account.

If you want to create another one then there are instructions on this page for doing so : http://support.apple.com/kb/HT2731

Or if you don't want to give credit card details then follow the instructions on this page when creating it : http://support.apple.com/kb/HT2534