I love rag quilts, they are so soft and cuddly!!! You will find a great many tips here by doing a search on rags quilts.
I have to clip mine outside, lint everywhere lol!!!
A really great tip from this forum was to wash the quilt (after clipping) in a pillow case to collect the strings, lint from the frist wash.
I also clip as I go cause the clipping can be really hard on the hands. I like mine to fray well so I clip close together before washing.
Denim makes great raggedy quilts!!!