My best advice, stay clear of weddings till you get the right experience. I have been covering events both via photography and video for 3-4 years and I still get chills from the idea of covering a wedding, also I can not afford a second body.
If you have zero experience, avoid!
What if something goes wrong and you ruin their special day.
I'd say practice at other events.
Also, it's very expensive if you have no kit.
I spent £3K on both my 5D Mk4 and glass.
For weddings, you usually need two bodies, preferably both full-frame.
I am planning to get one crop to accompany my 5D Mark IV as I don't want to be carrying big boy lenses when I try and get shots from afar, mind you, also do photojournalism and cover protests so.