need help with a shel script plzz

hey how u doing guys ... I'm a student @ EMU and taking a beginner Linux class and I have those two extra credit project that im struggling with so I hope to get some correction and help

write a shell script that will
1-prompt the user for a file name
2-check to see if the file exists
3-create the file if the file does not exist
4-then go back and repeat step 1 if the file doesn't exist

#!/bin/bash
if test -e filename
echo "the file is exist."
else
echo "the file is not exist."
echo "filename" > "filename1"
fi

==============================

the other script
create a shell script that will
1- prompt for four file names
2- combine all of the data in the first three files into the fourth one

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