I found it hard if not impossible to find out the setting that your sewing machine should be on .. Every machine is different and i got lots of good advice on here ..
I will add that you need a open toe quilting foot , one that is made for your machine . I bought a ' generic universal ' one and had lots of problems and it even knocked the timing out on the machine which them cost me a lot of money to put right so buying a cheap quilting foot wasnt a clever idea
It seems we all turn our stitch length to zero .. Its just a case of trying it out on a spare quilt sandwich to see what settings your machine is best on ..
Then write it down ! Cuz i never remember the settings once ive sewed normally !