Shell Programming and Scripting

I am currently a student enrolled in a UNIX class and am in need of help for a project. I have to write a script that will run the grep command on a particular word or pattern in a specific file defined by the end user. however, I have got stuck. What I have so far is:

clear
loop=y
while [ "$loop" = y ]
do
tput cup 2 23; echo " ~*~*~*~*~*~*~*~*~*~*~*~ "
tput cup 3 23; echo " * Search for a Pattern * "
tput cup 4 23; echo " ~*~*~*~*~*~*~*~*~*~*~*~ "
tput cup 6 5; echo "Type in the pattern and path to the file you want to search for below,"
tput cup 7 5; echo "or type Q to return to previous screen."
tput cup 9 10; echo "Ex. : help /home/james/project/help"
tput cup 11 5;
read choice || continue
case $choice in
[Q,q]) clear; exit ;;
*) grep * ;; esac
done

I know that the grep * is telling it to look for a wild card, but I'm not sure what I need to change it to. any help is appreciated. Thank you.

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