For newspaper clay, one needs to soak newspaper in water completely, squeeze the water out and mix the paper with hands or in a mixer, till it is smooth. Then add flour with colour till it is malleable or glue/ Fevicol, which will result in papier mache.
Ekta, you can cut four or five round pieces of paper (the size of the stud base you want to paste). Paste two papers on the quilled design then stick the stud, then stick the remaining paper pieces on the stud, piercing hole. That way the stud base will be secure. Hope this helps.