Thanks for checking in with us, motheratcare.
It is not advisable to mix your personal and business funds in QuickBooks Online (QBO). Also, your check and credit card accounts should be business-only accounts. However, if your business and personal finances mix, you can refer to these articles on how to properly handle them:
If you have an employee who uses their funds for business expenses, just refer to this article on how to reimburse them: Reimburse an employee.
On the other hand, please reach out to your accountant on what are the varieties of expenses you can claim.
I have a link here where you can find articles about managing vendors and expenses: https://quickbooks.intuit.com/learn-support/en-us/expenses-and-vendors/07?product=QuickBooks%20Onlin....
Feel free to go back to this post if you need a hand with running your financial reports or any QBO related. I'm glad to help.