On my iPhone I have a couple of queries…?

I have a couple of things that I need help with, (and I have read the manual!) Bluetooth - when I turn it on, it doesn't find other devices even though other devices can find mine. Is there anything that I can do about this? Silencing the phone - is there a quick way to put the whole phone on silent? I have to go to the settings and turn everything off or down (and even after I've done that sometimes the camera still makes noise when I take photos) Is there a way to send a few photos at a time to someone via email? Thank you very much for your input.