I think it would be good for you to establish what your interpretation of 'street' will be.
Ideally it will be shots of interactions between people and their surroundings, sometimes interesting, sometimes, tragic ... sometimes funny ...

Reminiscing by
photogramps, on Flickr
Many people like 'street candids' where the focus is more on a person in the street, rather than necessarily involving interaction with the surroundings ...

The Fair Sax by
photogramps, on Flickr
I personally enjoy this type of work but beware, the 'street police' will chastise you for not being 'really street' ... just enjoy yourself if you like that format
People you shoot vary a lot, some are really friendly ...

I See You by
photogramps, on Flickr
Others could make you worry a little ...
Others will present you with a 'fun' combination shot ...
I have used a 24mm f1.4 and a 70-200 f2.8 but my most used is the 24-120 f4 'walkabout' lens - I have no hangups about using a zoom, it helps me frame the photo I want at the time.
I think that the most important thing is, if you are spotted give a big friendly smile - if approached offer to show them the image and even send them a copy if you feel that's appropriate - I've sold images to relatives of some of the subjects from my street/candid work.
For many people 'street' means gritty mono images with disjointed parts of people and buildings/objects - it doesn't mean that to me ... I'm not saying I'm right or they are wrong, I'm just saying that I do what I like for my 'street' photography and I suggest that you do the same, experiment, see what you enjoy doing and do it ... for you it may be the gritty mono images but remember, unless you are shooting to an itinerary or a brief, you can express yourself in the way you want to and can essentially, please yourself.
