Hi again, Shirley.
I can tell you have a lot of questions about this and are considering the different way you can handle these finances. QuickBooks Team members like myself are trained in the technical use of the program, but we don't have accounting training. For that reason, even for the questions you've just asked, I suggest an accountant. We do have an article here in the QuickBooks Community that explains the chart of accounts and touches on different account types, which may be able to help get you started before reaching out: Learn about the chart of accounts in QuickBooks
As for whether you enter the amount as equity or a loan could depend on a few things that, again, an accountant would be able to help you sort out. However, if you did want to check out how QuickBooks outlines handling business expenses paid for with personal money that you're intending to be repaid, feel free to check out this article: Pay for business expenses with personal funds
You may be able to do some research into these areas yourself, but to have certainty with the steps you're taking, an accountant is your best solution. I hope that helps clear things up a bit for you.