If you're a student just keep making friends and asking around. If you've never smoked before you don't want to be buying off the streets. Due to our lovely ridiculous fucking laws the only people left selling on the street are usually dodgy as fuck selling crap or contaminated weed.
If you're in London walk around Camden, one of the only places left to buy safe stuff on the streets, otherwise just keep making friends as I said and ask around. Someone will help you out and once you're in you'll be set . . . at least for a while haha. Good luck :thumbsup: