Hi mam_maleki-yahoo,
Welcome to the Community. QuickBooks Online is a flexible program that simplifies the way you manage your books. I'd glad to help.
Based on what you've described, I see you benefiting more from contacting an accountant to point you in the right direction regarding recommendations for invoicing your monthly charges. If you don't have an accountant, you can find one near you by clicking on My Accountant on the left navigation menu> and then Find a pro to help.
Let me know if you have questions, I'll be happy to help.
