Don’t you have to obtain the marriage license first

yep, gotta pay the tax man... You could just co habitate and be considered common law married after 6 months

Some states will let you get a marriage license and get married on the same day. Some marriage license offices will even perform the marriage for you on-site for a fee, without an appointment. It depends on what state and county you live in or what the practices of that particular licensing office are.

Some states make you wait after getting the license before you get married.

right

In Louisiana that’s how it was