Shoot manually - Shooting manual can be tricky at first, since you need to be able to manage the settings; aperture, shutter speed and ISO to get a good result. The best thing you can do to learn how to combine these three? Practice, practice and then practice some more. You will get better and better the more you photograph, but make sure to photograph manually even if it can seem hard at first. On YouTube you can find lots of videos demonstrating how to shoot manual photography!
Think about the light - To end up with stunning photos, you should take them during golden hour, meaning that time of day just before the sun goes up, or goes down. Shooting during mid day can often give you harsh contrasts and can darken some parts of your face, for example under your eyes. To avoid that, try using a light reflector if you want to shoot your pictures in bright daylight. Experiment and try using the light at your disposal to find your own way of photographing.
Angles and framing - Avoid shooting using a low angle or a bird’s eye view - to minimize the risk of your legs looking shorter than they really are. You get a great angle if you let the person you photograph face you, and then make sure to crouch down a little when you take your photos. Also try to always focus on the person’s face (preferably the eyes) when you shoot. Full body shots are something that you always do when creating streetstyle photos, to get the entire outfit in one shot.
Camera gear - You don’t need a full frame camera to capture great streetstyle photos, it’s all in the optics. The bigger aperture you have, the smaller depth of field you have = blurrier background. I recommend you to purchase a 50 mm fixed lens as your first lens, and it costs under €200. Get to know your camera, your lens and challenge yourself by playing around with different settings. Don’t forget that nobody is an expert at first and that learning takes time.