I play without chin and shoulder rest for historic-period gigs. I got used to it so quickly I play without my shoulder rest a lot nowadays. I have a very tall chin rest on my modern violin, which makes the shoulder rest unnecessary, unless my clothes are too slick - in which case, I have a piece of deerskin I put between my shoulder and the fiddle.

There's right and wrong ways to bow and to hold the bow. This is something hard to describe without being there in person. Get a professional to show you how so you don't develop bad habits.