I scout for various agencies in my free time.
Let me tell you, its VERY difficult!
even the top scouts may only find one girl per week and even then, maybe none of those will go on to do anything.
if you are going to scout
firstly: make a contact with an agency (one or more if you want) so that if you find somebody, at least you have a legitimate reason for doing so, as well as somewhere to actually take the person
secondly: always carry a polaroid camera / digital camera to take some photos, as well as means of writing down some details of the person ( name, number, where theyre from)
thirdly: have something to give to them such as the same details you have taken from them (your name, your number, where you are from) so that they dont think you are just a random person wanting their number
if the girl/boy is under the age of about 17 then say that you think they have potentiol but you must speak to their parents also, its very important, as agencies can find themselves in a lot of bother from peoples parents if they find out their child has been approached and taken somewhere without them knowing
apart from that, just keep a good eye out, dont take it too seriously, sometimes you find someone, sometimes you dont
c'est la vie!