Glad to have you join us in the Community. QuickBooks is a robust program that simplifies the way you manage your transactions. I'll be glad to share more info and help steer you in the right direction.
The program allows you to create, send, and save your invoices to your computer. You can send invoice using the guidance in this helpful article here. You can send invoices via email in QuickBooks. If you're looking for more options to send your invoices, I suggest saving the invoices as PDFs to your computer then send them via WhatsApp from your computer.
Let me know if this info helps by leaving a comment below. I'll be one message away in case you need anything else. Otherwise, I wish you a great rest of the day!