Info about microdermals (behind ear, neck, clavicle)?

i want to get a micro dermal either behind my ear, at the base of my neck or on my clavicle. can anyone give me some info about any of them or their opinions. i dont have any tattoos, i have my belly button piercied and a couple ear piercings but no stretchers or facial piercings. i dont want to over step the line and start to look trashy/slutty/wannabe. im 16 years old and im a girl. i have a few tattoos i want to get when i turn 18 so will all of these things clash and look bad. opinons? thanks for any help