Buying my first holster for my new S&W Shield, what do I look for in a holster?

I'm thinking of carrying in the 3-5 o'clock position unless someone has any advice about appendix carry. I'm 6' and about 185lbs. I wear clothes that are more fitted than loose. Any general advice about carrying would be appreciated as well. Thanks! via /r/CCW http://ift.tt/2cE2swh