anyone know anything about civil weddings?

Ok so My boyfriend and I have decided to do a civil wedding, perhaps tomorrow

but i have NO freakin clue how to go about doing it.. anyone know what im supposed to do?

do i have to have a witness? we are planning on having a really big wedding in a few years when Tianna is old enough to be the flower girl,

but for now we need to be legally married so that Tianna and I can be added onto his open enrollment for medical insurance. so that's why we decided a civil wedding...

my dad said there are chapels that do same day marriages, but i have not a clue where to find them.. on the internet all i get are same sex marriage things lol..

help!