Money to and from an LLC (Shor-term rental investment)

[John Galang]

Hi all! Pardon my ignorance. Just getting started with forming my business structure...

Background: I have an multi-member LLC (two members: me and my WY holding company) that will soon hold title of a condo that be a short-term rental ("STR") in the coming weeks. In the future, other LLCs with properties will roll up into the WY holding company.

1) In the LLC's OA, there's a line for "Capital Contribution" - which I gather is money that I, personally, put in start-up costs. Now, how does one deposit this money when I open a business bank account, w/o it being considered co-mingling of funds (aside from depositing literal cash)?

2) Assuming a business credit card in this LLC's name, should everything purchased on this credit card ONLY be paid via the LLC's bank account, and never my personal bank account?

If I did that, is that considered "co-mingling" of funds?

3) Should I open a bank account for the holding company?

3a) If so, why and how is it used with the LLC that holds the property?

Thanks in advance!