First - welcome to the wonderful world of quilting! Hope you have an amazing time with this wonderful hobby/obsession.
Most people don't wash pre-cut fabrics like Jelly rolls, charm packs, etc. Quilt it, bind it and then wash it - be sure to add a couple of color catchers. To be honest most of us don't wash our fabrics first - even yardage. I know I don't unless I am doing a Red&White or Blue&White quilt.