Wow ... you started to dabble in photography by shooting a wedding? Are you INSANE!?!?
No, you don't need releases or anything of that nature for your own portfolio/website. you automatically own the copyright to the images and portfolio work isn't considered commercial use (at least in Canada and the US ... not sure about the rest of the world).
At a wedding there is no expectation of privacy ... it's a given that there WILL BE photos taken ... no one going to a wedding could reasonably (both logically and legally) have any expectations of privacy.
Same thing with photos in places where there is no expectation of privacy like on the street.
That being said, I've had clients ask that I don;t use their photos online. One of them, I agreed to (RCMP officer, they have a policy of trying and stay offline as much as possible).
If I can give you a bit of advice ... step away from weddings and any actual paid work until you've got all the business parts worked out (like knowing copyright laws and the likes ...) and until you've stopped "dabbling" unless you want to end up getting sued by an irate "client".
No contracts, no liability insurance, no backup gear, no decent gear ...