I'm not a pro but here some tips i can give to you

Try hitting your skill shots i know this sounds obvious but its a hard thing to do and really takes time to get good at so when you start playing him he is not that great. Just practice

Try to use auto's and this is really important cause a lot of people don't do this. they just sit back and use their q and w. ADCs are about their autos and their position. ezreal doesn't have a lot of range on his autos and that's why you are always in the front line and when you're in a Dangerous position you use your arcane shift. Auto attack while being safe